Mis placed the manual. How to thread the bobbin, and the needle.

Threading the Baby Lock BL2400 sewing machine can be done by following these steps:
1. Raise the presser foot: Lift the presser foot lever to raise the presser foot.
2. Thread the upper thread: Take the thread spool and place it on the spool pin at the top of the machine. Follow the numbered threading path indicated on the machine or in the instruction manual. Typically, the thread will go through a series of thread guides, tension discs, and the take-up lever. Make sure the thread is properly seated in each guide and tension disc.
3. Thread the needle: Thread the thread through the needle from front to back. You can use the automatic needle threader if your machine is equipped with one, or manually thread the needle by holding the thread with one hand and passing it through the needle eye.
4. Load the bobbin: Wind a bobbin with the desired thread and place it on the bobbin winder spindle on top of the machine. Follow the specific instructions for your machine model to wind the bobbin correctly. Once the bobbin is wound, place it in the bobbin case and thread the thread through the appropriate guides or tension mechanism, ensuring the thread is properly engaged in the bobbin tension spring.
5. Insert the bobbin: Insert the bobbin case into the machine's bobbin compartment, making sure it is securely in place. Follow the threading path indicated on the machine or in the manual to ensure the bobbin thread is correctly threaded.
6. Bring up the bobbin thread: Hold onto the top thread with your left hand and turn the handwheel toward you with your right hand to lower and raise the needle. As the needle rises, a loop of the bobbin thread will appear above the needle plate. Gently pull the top thread to bring the bobbin thread loop up through the needle plate.
7. Pull both threads to the back: Hold both the top thread and bobbin thread together and gently pull them toward the back of the machine, ensuring they are out of the way of the needle.
8. Perform a test stitch: Once you have threaded the machine, insert a fabric scrap under the presser foot and lower the presser foot lever. Select a straight stitch or another desired stitch on the machine and slowly begin sewing to test the stitching.
Remember to consult your Baby Lock BL2400 instruction manual for specific instructions and diagrams related to threading and operating your particular machine. It will provide you with detailed guidance tailored to your machine's features and functionalities.

OR you can watch the video below

try these suggestions
Not picking up thread can be several issues
1.bobbin is miss wound
2. bobbin case isn't snapped in properly
3. you're using the wrong type bobbin
4. needle is bent or burred
5. check bobbin area for lint & loose threads
6. little oil--check operation manual for this
7.machine is out of time --done by service tech
8.check automatic thread cutter to see if it’s bent
but most of the time the issue is once again mis-threading or the thread coming off take up lever
sewing machine needles put in incorrectly
Check & make sure needle is in the needle holder correctly.
Check your manual for threading diagram
check bobbin area including case for lint & loose threads
Take the needle plate off & clean under neath it ( if your machine has screws that hold the needle plate on be careful NOT TO DAMAGE THE SCREWS) because a damaged screw that has a burr on it can pull fabric
Each time you start to sew
1.make sure there’s 2 to 3 inches of top thread when you put the needle down for the bobbin thread
2.make sure there is a 2 to 3 inch of bobbin thread so the top thread can pick it up
3.Pull the tail of the top and bobbin thread behind the presser foot
hope these help--please rate this with the thumbs in the upper right hand corner-thank you

Get out the manual and refer to the maintenance section for cleaning the machine.

Especially the bobbin area. You want to make sure the area around the bobbin case is free of lint and thread.

Use a new bobbin and re-thread the machine, with the presser foot UP.

Install a new needle, again according to the directions in the manual. Installed incorrectly can lead to mis-stitching.

If the problem persits, the timing may need adjusting.

This should be done by the sewing machine tech for Kenmore.

Sewusa.com has a guide for this in the repair section, but you could end up with more problems.

Open the manual and refer to the maintenance section for cleaning. Clean away any thread or lint that may have accumulated.

Go to the front of the manual and follow the written instructions for winding and inserting the bobbin into the bobbin case.

Then follow the written instructions for threading (presser foot up is often overlooked).

Lower the threaded needle then raise while holding onto the thread tail.

Lift the bobbin thread and pull both threads under the presser foot and to the back of the machine.

Place fabric under the presser foot and while holding onto the thread tails, hand walk the first stitch and then use the power pedal.

If you have to stop mid-seam, or to turn a corner make sure the needle is down and this will help prevent mis-stitching.

Check the needle to be sure it is not bent or mis-installed. The flat side of the needle shank faces to the back to the machine.

If this does not work, open the manual and wind and install the bobbin, then thread the machine - using the written instructions as the pictures, although helpful, can mislead.

Continue by lowering and raising the threaded needle (hold on to the end of the thread) to bring up the bobbin thread.

Pull both threads under the presser foot and to the back of the machine.

Hold onto the threads and lower the needle into the fabric and then use the power pedal to begin sewing.

If the top and bottom thread still do not form a stitch, the machine needs to go into the shop for service as the alignment needs to be adjusted.

First, open the needle plate and make sure the bobbin area is clean and free of lint and thread.

Check the needle to make sure it is not bent and is properly inserted into the holder - usually with the flat side facing to the back of the machine.

Refer to your manual for bobbin insertion to be sure the thread is feeding from the bobbin in the correct direction and through the proper guides.

Always thread a sewing machine with the presser foot up. This opens the tension control and allows the thread to properly enter.

When the foot is down, the tension control closes to the sewing setting and if the thread is not in place, there is no tension on the thread and it gets loopy.

After threading, lower and raise the needle while holding onto the thread tail. This will pull the bobbin thread up through the needle plate. Take hold of both threads and take them under the presser foot and to the back of the machine.

Hand walk the first stitch when sewing and this should keep the top and bottom thread from tangling.

When stopping to change the position of the fabric (turning a corner, sewing a curved seam for example), do so with the needle down into the fabric. This not only anchors the fabric so it does not slip, but prevents mis-stitching.

If you are doing everything according to the manual and are still having a problem, the machine may need to be professionally serviced.

Open the needle plate, remove the bobbin and bobbin case.....refer to your manual.

Clean away lint and threads.

Thread with the presser foot up.

If this continues, take the machine and samples of the mis-stitching in for service. It could be the timing needs to be adjusted by a professional.

You would be best to download an instruction manual for your machine as it explains clearly, with diagrams how to thread and insert the bobbin. You probably wont find the 530 manual however download a copy for Bernina 530-2 or 532-2 as they are almost identical to the 530.

Be sure to check that the machine is threaded properly into the needle. Also look at the instruction book to be sure you have the bobbin inserted corectly and that the thread is place properly (threaded correctly) in the bobbin area. Some machines have a diagram on the machine, but if you do not sew frequently; it's easy to mis-thread the bobbin. Did your bobbin thread wind properly onto the bobbin (not loose or loopy). That too, can be a problem. Best of luck. Susan

From the Simplicity Sew Precious Model SWSP2 manual:

Inserting a new bobbin:

1. Place wound bobbin into the bobbin case.
2. Pull about 6 inches of thread out from the bobbin.

NOTE: Be sure that the bobbin rotates COUNTER-CLOCKWISE when thread is pulled.

1. Pass the thread from the bobbin, under the bobbin case spring, and toward the back of the machine.
2. Slide bobbin cover back into position.

Upper threading:

1. Turn the handwheel toward you to raise the take-up lever to its highest position.
2. Lower the presser foot.
3. Place a spool of thread and spool cap on the spool pin.
4. Place the thread into the first thread guide at the top of the machine.
5. Bring the thread down the right slot of the threading path, then around the tension dial. Push the thread tension release lever and pull the thread up so the thread is secure in the thread tension dial.
6. Bring the thread up the left slot of the threading path and through the take-up lever from right to left.
7. Bring the thread back down the left slot of the threading path and into the needle eye from front to back. (Clip the thread end with sharp scissors fro easier needle threading.)

Raising the bobbin thread

1. Make sure the presser foot lever is raised.
2. Hold the end of the needle thread with your left hand. Turn the hand wheel toward you with your right hand until the needle goes down once and comes back up, stopping when the needle is at its highest position.
3. Gently pull up on the needle thread. The bobbin thread, looped around the needle thread, will be drawn up through the needle hole.
4. Push the thread tension release lever and pull about six inches of both the upper and lower threads toward the back of the machine, placing them under the presser foot.

You can obtain a copy in pdf format for free at:
http://www.simplicityhomecare.com/ftp/whitepapers/SWSP2-english.pdf