I solved my first serger problem!

I've made a lot of progress. I mastered completely rethreading the serger. Helpful hint -- when you are first learning to use your serger, thread it with the color threads of the loopers and needles. It REALLY helps understand what's going on. I also played around with converting from 4-thread, 2-needle to 3-thread, 1-needle. It's when I tried to go back to 2-needle I ran in to a snag. My upper looper (green) was not catching my left needle (red) thread. My left needle thread was not engaged in the serging process at all. This drove me crazy for 2 days. I tried adjusting tensions, seam widths, etc. with no luck. The only thing I had done to convert to 1-needle was to remove the left needle, so maybe the needle was not in right. When I watched in slow motion I could see that the upper looper was not catching the left needle thread. Eventually I realized that if I pushed the needle forward a bit, it caught the looper. I then referred back to the picture in the book. Sure enough, in the picture, plain as day, it shows the left needle is shorter than the right which meant I didn't have the left needle pushed up all the way. Once I adjusted it -- perfect! I'll post a picture. Maybe I'll save someone else some misery.