You need to remove both the rear seat bottom, and the rear seat back to get to the screws that hold the side panels in place. IIRC, I think it's 3 screws. You'll also have to pry up the inside window trim (wedge a flat blade screwdriver under the chrome part just behind the "B" pillar, and pry it up gently - then you can get a hold of it, and pull it up and out). After that, the panel can be pull up and out.