Unplug the microwave from the wall outlet.
Remove the three screws at the top of the grill at the top of the front of the microwave. Pull the grill from the bottom, then tilt it upward to remove.
Lift the tab on the oven light cover, then push the tab back. Remove the oven light cover.
Unscrew the old light bulb and screw a new one into the socket.
Close the light cover, then reinstall the grill and restore power to the microwave.
Unplug the microwave from the wall outlet.
Loosen the screw on the side of the light cover, located under the microwave.
Lower the light cover, then unscrew the light bulb from the light socket.
Screw the new light bulb into the socket.
Re-secure the light cover using the screw you removed, then restore power to the microwave.