WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Open the front door.
Starting at the rear of the rocker molding scuff plate and working forward, lift upwards on the scuff plate to release the retaining tabs.