More greetings
@pip !
I did what someone else mentioned with my serger when I got it. Mine's a Singer and has color coding to show how to thread it. So I changed to matching thread colors so I could really study what each thread was doing.
Only being true to my name here I was brazen. Took a deep breath and cut all the threads and totally unthreaded the machine and started from scratch. I've only done the tie on once and didn't enjoy it so every color change is a complete rethread. I give it a good cleaning and floss out the tension disks while I'm at it.
It helps that Singer has an online, full color photo PDF tutorial on how to thread it. The tiny B&W photos in the manual are worthless.
So show it who's Boss. They're not really scary so long as you keep your fingers away from the blades.
Again, welcome!