There is an access panel on each side at the back above the rear tires. Remove the access panel on both sides and then turn you lights on so they illuminate, you can pretty much tell which one is burned out because the one on the side that is working will tell you which socket it is. Reach your hands in on the burned out side and twist about a quarter turn (counter clockwise I think) and then it will pop out. The you can remove the burned out bulb. Put the new one in the sokcket and make sure it lights up before putting everything back together. Hope this helps.