getting cover off sewing machine

I am trying to look inside my machine to see if I can fix what is likely a problem with a belt.
This video shows my machine and the problem.

The machine is a  Singer computer 7900 , which as far as I can tell is a Japanese only machine, though it appears similar to other computer machines. What I want to do right now is to remove the cover, but I haven't figure out how to do it. I have taken off two screws on the back top, and I can take off the bottom, and a small screw near the power cord. BUT I can't figure out what else I would need to to get the top off. Any hints?

caitlinsdad3 years ago
Can't see your vid or what the machine is but maybe this might be similar to your machine. Good luck. http://sewing.wonderhowto.com/how-to/disassemble-your-home-sewing-machine-for-routine-maintenance-420796/