WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Steering Column Filler Panel
Courtesy of GENERAL MOTORS CORP.
Remove the screws from the steering column filler panel.
Pull on the trim panel to disengage the trim clips.