i did a how to for this in the audio section i think.
anyways, pop up the bench seat. youll see 2 torx screws, one on each side attaching to the back of the seat. t45 or t50. take them out, then pull the seatback up and out. kinda tricky, you need a friend to help. there is a plastic/metal clip in the trunk that attaches to the seat and needs to be manuvered around. take a look at the whole thing and you will see. anyways, then pop out the plastic screws attaching to the rear deck and it will slide out. does not matter if you have fold down seats.
kind of a fast write up, but there ya go. any questions just ask.