Remove the two screws securing the bulb over the license plate with a Phillips screwdriver.
Pull the light forward until the bulb and socket slide out of the mounting area. Twist the bulb counterclockwise and pull it out of the socket.
Insert the new bulb into the socket and turn it clockwise to lock it in place. Insert the new bulb and socket into the mounting area.
Tighten the two mounting screws on each side of the light assembly with a Phillips screwdriver. Repeat the process on the second license plate light if necessary.