WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Remove the screws from the license lamp lens.
Remove the license lamp lens from the liftgate.
Pull the bulb from the license lamp socket.
Fig 1: Removing License Lamp Lens And Bulb From License Lamp