Here is a shot of my seat frame, as stated above once the three screws are removed the cushions will pop out. If you want to remove the frame there are four studs with nuts on top that come off the tracks in the corners. You can see them in this shot, you will also need to remove the clamp you can see mid-frame from the cable. A word of caution the corners on the bottom are usually full of spilled coke and junk. Spray them with a good penetrating oil as they will snap off.
https://www.flickr.com/photos/advance-design_parts_co/8129072768/in/set-72157631867396207

KMAC