I'd recomend taking the seats out, so you can detatch the fabric in the back. Whoever did mine didn't do that, and the tab is broken. But here are some pics which should give you an idea. The seat back cushion is a separate piece that is attached by a plastic track to a bar in the seat frame. If you take the seat out, and detatch the back fabric from the seat bottom, you should be able to see the plastic track coming in from the front.