I know it might sound silly, but it took me a bit to really realize that the colored threads in the diagrams are the same colors as were noted on the machine, and in the "this is what the finished stitch looks like" areas.
I agree, go to a local sewing shop (did you buy it at a shop or online?) and have them help you. Most of the time the trip is well worth it.
Sergers can be tough, but they're oh so nice to have.