I have 2 sergers and I use them both but they are at different houses. The main thing is to have the knobs set at the number that is colored. If you open the little door below, it will show you exactly how to thread it, it takes 2 needles, and each is color coded. If the left spool of thread is yellow, then the knob has to be set on yellow. The one with green should have the knob at green, and so on. Usually, I have a large pair of tweezers to thread the needles. It takes time but it surely is worth it. Hope you get it going. I cherish mine. The best for pants hems.