WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Push the ends of the weatherstrip onto the endgate flange corners.
Push the weatherstrip molding onto the flange along the entire length of the endgate.