You do not say if it is the top stitches or the bottom stitches for the bottom tension, check that the thread is tight around the bobbin. Make sure that the bobbin is in the right way around - the bobbin thread should double back on itself coming out of the bobbin holder. The bobbin tension adjustment is the small screw in the plate on the bobbin case that the thread passes under as it comes off the bobbin and goes out.
For the top stitch, tighten up on the tension adjustment on the front of the machine which looks something like this:-
Posted on Apr 11, 2011
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