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Assuming this is a 4-thread serger. The thread tension setting will depend on which stitch you are making. A standard 4-thread overlock stitch would generally have the tensions set in the middle. FWIW, the tension in this setting is correct when the threads meet in the middle of the fabric. It should neither be off the edge of the fabric or so tight as to create a puckered edge.
try changing the needle rethread the machine top & bobbin clean under the needle plate & in the bobbin area for loose threads or lint check to make sure the bobbin & bobbin case is not damaged
The easiest way to get your threads adjusted and learn which thread does what is to thread the machine with 4 different colors. Set your tension dials at 4,3,2,1 from left to right. This is the starting point. Sew on a test strip and look at the threads. You can then adjust the correct tension dial according to the thread color. This is a great way to get the machine set back to correct tensions as well as a learning tool to figure out what each thread looks like so you can adjust later when using all one color.
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