Locate the rear side marker. It is a small, red or orange plastic lens located on the rear quarter panel of the vehicle.
Remove the two screws that hold the rear side marker in place. These screws are located on the inside of the vehicle, behind the rear side marker. You may need to use a screwdriver or a socket wrench to remove the screws.
Once the screws are removed, you can pull the rear side marker out of its housing. Be careful not to drop the rear side marker, as it is made of glass and can break easily.
To install the new rear side marker, simply insert it into the housing and tighten the two screws.