WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Open the rear compartment.
Remove the bulb/socket from the backup lamp.
Remove the bulb from the socket, if required.
Fig 1: Removing Backup Lamp From Rear Compartment Lid (Chevrolet)