Remove from the back and you will find a white little box unscrew that and then take the bulb out and replace with the new one
Naymar
September 2013
You have to unscrew outer housing and lift up from back of unit,have fun removing the tork screws with the nipple in the middle paiiiinnnn grrrr.ensure microwaves unplugged before removing cover and DONT touch anything in the unit other than the light bulb base which should snap out in your hand