Material not feeding automatically

The blind stitch would look like a couple of straight stitches and then a :"V" shaped zig-zag that will zag left to catch the very edge of the folded fabric.
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here's the manual:

http://homeappliance.manualsonline.com/manuals/mfg/singer/4212.html (pgs 55-56)

Perhaps these will help:

My new Singer Stylist 7258 keeps getting message code C4 and can find...

Unable to fix Singer 6199 C4 error code after reading manual figured it out

Singer Patchwork C4 error

..

Your machine takes standard sewing machine needles, available from quite a few manufacturers like Organ, Schmetz and Singer. I have even seen them for sale in drugstores! Most people use #11, #12, or #14 needles--the higher the number, the larger the needle, and the thicker the material. In addition, Sharps are used for all woven fabrics like cotton and wool; ball point needles are used for things like t-shirts and other knit fabrics. Home sewing machine needles range from #8 to about #18. For instance, you would probably use a #14 or #16 needle for Jeans, although for those, there are also specialty Jeans needles you can also use.

Is the fabric where you are having trouble very thick? If so you may have to help the machine by leveling out the foot with a popcicle stick or something and using the hand wheel.

The main types of feet are:
1. ZigZag foot. This has a wide gap for the needle to move from side to side and the two pointy ends of the feet curve upwards. This is used for ZigZag and decorative stitches,
2. Straight Stitch foot. This has a small round gap and one side is usually wider than the other. It's used for straight stitching.
3. Rolled-Hem foot. This has a spiral in the middle and is used for rolling and sewing hems neatly.
4. Zipper Foot. This has no gap as the needle goes to one side or the other of the foot. It usually has two attachment points for snapping on to the shank, depending on which side of the zipper you are sewing.
5. Invisble Hem foot. Used for making invisible hems. It's hard to describe how it looks. Mine has extra white plastic parts around it and some kind of screw to make adjustments as to width etc.
6. Buttonhole foot. My buttonhole foot is white and has numbers along one edge. The size of the buttonhole can be altered, using the numbers as a guide.
7. Edging foot. This has a strip of springy metal on the left side and is used to guide the material into the path of the needle in order to sew close to the edge to prevent fraying.
8. Rolling foot. This has rollers and is useful for sewing thicker materials or quilts etc. It is similar, but not as good as a walking foot.
9. You might also have a Teflon ZigZag foot, it's the same as the zigzag foot but made of white plastic. It's used for sewing vinyl and leather materials.
I think that's it, hope this helps!

If you want the bottom of the T to look like RTW with the double row of stitching, you cannot do this on a serger.

You can achieve the effect by using a twin needle, two spools of thread, bobbin and a straight stitch.

Make sure the double/twin needle will pass through the presser foot and opening in the needle plate below the presser foot.

Practice on a double layer of a scrap of the T shirt material as the tension may need to be slightly looser than the normal setting.

You need to look in your manual and see how to turn your cutter off . It's different for each type of machine.

you should always use needles that are the right size and sharpness for different fabrics. any fabric store can help you with this. according to your machine the smaller the # on the needle the finer teh fabric it will sew. also using the right weight of thread is important...light weight thread for light weight fabric and heavier for thicker fabrics

The bes way to hem a t-shirt on a household machine is to use a double needle, straight stitch. You will see two straight stitches on top and zig zag on the back. Just make sure the zig zag catched the top of the hem.

The machine will feed the material you only need to guide it gently and it will sew the letters sideways.