Hi. If the bobbin thread is coming up on top, then the upper tension is too tight. Try loosening it.
Hi. The best way to adjust your tension is to use good-quality thread, a size 12 needle, and different color threads in the bobbin and on top. That way, it's easier to see which thread is loose. Sew a few inches, check, and adjust (make sure the pressure foot is DOWN). Stitch a few more inches, recheck, and adjust some more. Just move the adjustment knob a little bit each time.
You might also want to use a bit of unwaxed dental floss and floss the tension disks. That helps get rid of any old lint and pieces of thread that build up in there.
As a last resort, you might need to adjust your bobbin tension. There is a very small screw on the bobbin case that tightens/loosens the spring/lever. If you need to adjust it, only move the screw a tiny bit. But, like I said, this is only a last resort--almost all adjustments can be done by adjusting the upper tension.
Hope this helps!
Robbie
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