WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Install the dome light bulb.
Fig 1: Installing Dome Light Bulb
Courtesy of GENERAL MOTORS CORP.
Install the dome light lens cover.
Fig 2: Installing Dome Lens Cover Using A Flat-Bladed Tool