Normally on vauxhalls you remove connecting wires to bulb holder, then turn the bulb holder a quarter of a turn and pull out. Bulb should just pull out of holder, remember when replacing with a new bulb, not to touch the glass with your hand as this can damage the bulb, use a cloth if need be. Line up the holder in the position where you remove it and give a quarter turn in the opposite direction to lock in, replace connecting wires and jobs complete.
Good Luck
Brian L
December 2009