You may need to remove the glass cover by turning it anti-clockwise.
On some models access to the bulb is from outside so the oven has to be slid out of it's housing and an access plate removed.
chek this following steps..
Make sure the bulb is actually burned out. Confirm the oven is plugged in and that a circuit breaker is not tripped.
Look for the manual to determine what size bulb is required. Most use a 40 watt appliance bulb. If you can not find the manual, then buy a bulb to replace it after you take out the old one.
Confirm that the oven is not on. Allow it to cool to room temperature if it has recently been used.
Open the door and use a flashlight to light the area where the bulb is located. Do not put weight on the door itself, but go in at an angle or sideways.
Find the shield or cover over the bulb, gently pull or twist it off. Some glass covers are surrounded by a wire clip or a ring that is screwed in to the back.
Gently remove either the wire clip or ring. Since the cover is most likely glass, be cautious. Unscrew the entire glass cover similar to a jar lid in older versions of ovens. Then repeat process if there is more than one bulb.
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