Open your tailgate, there will be 3 gromets you have to remove on the edge where the tailgate meets the side of the bed. I believe it's a 7mm socket that you'll need. Remove the 3 screws, and pull the light straight towards the rear of the truck, not out to the side, but straight back. It may take a little force. Untwist the bulb you need out of it's housing, pull the bulb out of the socket, it's a 3157, and replace. Go in reverse to put it all back together.