WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Rear Washer Nozzle
Courtesy of GENERAL MOTORS CORP.
Install the washer nozzle (6) to the rear washer hose connection (5).
Position the rear washer nozzle (6) to the liftgate opening, pressing in until fully seated.