Open the rear passenger door.
Locate the plastic cover on the rear seat. It is the piece of plastic that covers the seat cushion and backrest.
On the bottom edge of the cover, near the side of the door, you will see a small black tab. Press the tab down and pull the cover up and away from the seat.
The cover is held in place by two plastic clips at the top. To release the clips, push them inward with your fingers.
Once the clips are released, the cover can be removed.
To reinstall the cover, simply align it with the clips and press down. The clips will snap into place, securing the cover.