Is there a dial on the right above the flywheel? This is where you adjust the stitch length on most sergers. It might be numbered from 0 to 5 or 4.
If it has differential feed, there would be a dial there for this too, possibly under the stitch length knob - it would have numbers like -1, -0.5, 0, 0.5 and 1 on it.
If you are new to sergers/overlockers I highly recommend a class, demonstration or investing in a good book to get you started as they are not like sewing machines and many of the techniques are best demonstrated such as rolled thread edging and flat lock seams.
I've borrowed he Singer book "Sewing with an overlocker", or "Serge with Confidence" by Nancy Zieman from my library but there would be other titles too.
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