The trunk won't open, I believe it's jammed. on 2002 Chevrolet Malibu

The trunk won't open. I believe it is jammed. the key just turns, the electronic trunk button just clicks. The back seat is suppose to fold down but cannot pull the cord located in the truck. How can I get the back seat fold down from the back seat? The bottom comes out but how can I get the upper part to fold down or come apart?

Asked by for the 2002 Chevrolet Malibu