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 washer nozzle (1) to the rear washer hose (2).
Position the rear washer nozzle (2) to the liftgate opening, pressing in until fully seated
Fig 1: Installing Washer Nozzle To Rear Washer Hose