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 storage tray guides into the track (1) on the seat.
Push the storage tray (3) rearward, overcoming the locking tab.