The cover on the back of the lamp is held on with a metal clip, unclip that and it will pull away, but not completely as the wiring loom goes through the cover. The bulb is an H3, has a negative wire that comes off the back of the bulb that connects to the negative terminal inside the lamp. The bulb is held in with a spring clip and shouldn't be too hard to remove. As the car owner's bible, the mighty Lord of Haynes says, refitting is the opposite of removal.