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Looks a lot like my Juki MO-104. To thread this thing remember this sequence.
Upper Looper, Lower Looper, then needle(s)
Open the front panel to get to your lower loopers and I think there should be a threading diagram inside on the door. Then always have test fabric that matches your project fabric. Sew a 3 " seam, check the seam.... adjust tension. If you want to get really good at seeing what's what in tension is doing thread each thread with a different color. To do your test stitches.
1. Try to remember TTN when you run into problems like this it stands for Thread, Tension, Needle. Contrary to popular belief, there is no such thing as universal thread and needles. You'll need to determine what kind of thread and needle is best for your application.
2. When things gets bunched up under the fabric it Usually means that the tension for the top thread is too loose. However, a bad, bend or just plain wrong needle will cause these problems too.
3. Always grasp the threads (both top and bottom) and pull gently backwards when starting a seam. Some old school seamstresses and seamsters say to make sure your needle is at its upper most position (just before it starts to move down) before you begin sewing.
4. since you've had a couple instances with this issue... you might have to clean the bobbin race area. I'm a bit reluctant to tell you about this but remove the bobbin and look carefully for other stray threads, dust bunny's etc.