Both headlight adjust at the same time, with one adjusting screw for up and down. Side to side is individual. The up down adjustment is the long white capped screw in the middle. If only one is off, it is probably not seated properly. There are tabs on the light that must seat in a slot inside the headlight. Be careful loosening the locking clip so as to not lose it. Do not remove it. It is best to watch the video.