Before the Easy-Bake oven is ready to use, you’ll need to install a 100-watt light bulb into the back of the unit. To install the light bulb, use a Phillips screwdriver to remove the screws from the back panel. Once the screws are loose, lift the panel from the unit. Screw a standard 100-watt light bulb into the socket located on the back of the panel. Replace the panel when you’re finished. Avoid using high efficiency or soft white light bulbs, because the machine will only function with a standard 100-watt bulb.