Those are great instructions Henry,
But I believe he was asking about the Third brake light, the one on top of the subwoofer.
Here is how you do it..
For just the bulbs, open the trunk up, look undereth the brake light from the trunk.
You'll see two sockets where the bulbs are located, unclip the wire socket with the bulb out of the housing by turning it counter clockwise..
pull the bulb straight out of the socket.. replace with a new one..
I reread your post again.. and it almost sounds like you want to remove the whole cover.. it's easy as well.. you'll have to get to the side of the subwoofer cover, pull from the back first, then the front.. there is a flat plastic part that slides behind the rear seat and the read deck.. just pull it straight up out of that..