You pull the tail lamp out from the back side of the car, not from inside of the trunk. That is, stand behind the car and pull the tail lamp towards you, but not too far as the wiring will still be attached to the tail lamp. The brown piece will stay in place. Hope this makes sense.
2011 GT Coupe Premium, Black exterior with Charcoal black turned leather interior. Rapid spec 400A with 6-speed MT, 3.73 limited slip axle, 19" painted aluminum wheels, HID headlamps, comfort package. FRPP tune with K&N air filter. FRPP Touring axle back exhaust with Borla 2 3/4" over axle pipes. ST Suspensions coilovers w/GT500 mounts. Spohn poly/del sphere adjustable lower control arms and Spohn adjustable panhard bar with Steeda panhard bar brace. Hotchkis Sport sway bars.