I have a 92 civic hb, and the bottom part of the back seat (where the bum goes) for some reason is very loose, an what I meant by that it could be lifted up from the rear side of the back seat and slightly from the front side it seems but it is fastened down from the middle, I was just wondering how would u be able to remove the entire bottom of the back seat, so I could analyse it, and put back together properly, any help would be appreciated.

Mine does the same thing...maybe its only supposed to be fastened in the middle. I have run alot of wires under that seat though and my best guess would be to look under your spare cover, and under the car.
good luck