WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: HVAC Module, Outlet Duct And Screws
Courtesy of GENERAL MOTORS CORP.
Remove the two screws (1) from the outlet duct (5).
Remove the outlet duct (5) from the HVAC module (2).