I don't have that particular model, but most sergers have similar threading. You probably don't need the manual at all; the serger itself should have a colored threading diagram on it (usually inside a cover). The colors will be numbered, which means that you must start with thread #1. Threading in a different order will cause the threads to break when you try to sew.
What I do with the first thread is hold it in place with the presser foot so it doesn't get dislodged while I am working on the second thread. I add each thread to this as it is finished, so the presser foot keeps them all in place for me.
Once you get it threaded properly, next time you can just cut the threads up near the cones, tie on the new threads (except for the needle threads), and pull them through the loopers.