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.
Install the seat back finish panel to the seat back.
Install the outer portion of the push-pin retainer to the seat back finish panel.
Install the push-pin retainer until it locks into place.
Fig 1: Installing Seat Back Finish Panel To Seat Back