Rear Side Panels

Hello everyone.

I have a 2004 Toyota Echo 2 Door Hatchback.

I was wondering if anyone knows how to take either the rear side panels off or the cup holders in the rear sides out? I tried to pull it out and got half of it out but the other side feels like a screw is holding it down from the inside of the panel.

i am going to be installing rear speakers and a new 4 channel amp so I need a way to run and hookup cables properly.

Also is the deck a 2 DIN or 1 DIN? No manual... :/

All help is appreciated :)