If we had your full model number, we could help you more precisely.
The first step is to unplug the oven before changing bulbs!
See a diagram which helps you find & replace many GE cooktop and cavity light bulbs
http://031d26d.namesecurehost.com/mwd/ge_lamp_replacement.jpg
If there's no obvious removable cover over the bulb (most often on the rear or side) and the owner's manual doesn't address it, then disassembly will be required.
You'll need to remove the outer cover (wrapper) to get to the bulb.
Always unplug a microwave before removing or installing any bulbs.
If it's an over the range type, remove the vent grille across the top and see if bulbs can be accessed there. There may be a panel on the bottom covering the light(s), instead.
If not, chances are you'll have to remove it from the wall, then remove the outer cover. If so, the installation instructions are very handy, and it's best to have two people since the microwave can be heavy and awkward.
If you don't have your instructions, please reply back with your brand and model number.
Once it's out of the wall, the outer cover (wrapper) will need to be removed, just as you'll need to do on a counter top model.
On a counter top model, be sure it's unplugged, but otherwise ignore the instructions above this paragraph.
You'll need to remove the outer cover (wrapper) to get to the bulb.
See these links before proceeding:
http://031d26d.namesecurehost.com/mwd/safety.txt
http://031d26d.namesecurehost.com/mwd/disassembly.txt
The screws you need to remove should be pretty obvious, but a special driver (such as a T20H type or GTXH20-100) may be needed.
Be sure to put all the screws back in the right holes, since some may be special grounding screws.
Bulbs (or 20A ceramic fuses) can be had locally in most grocery stores, hardware stores, home improvement centers, and big box or department stores.
Many models use halogen lamps. You must not touch halogen types with your bare skin, as the oils will shorten the bulb life.
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