WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Position the I/P upper trim pad (4) tabs to the I/P retainers.
Fig 1: Installing Instrument Panel (I/P) Upper Trim Pad Retainers (Pontiac)
Courtesy of GENERAL MOTORS CORP.
Install the I/P upper trim pad (4) to the I/P, pressing into place until fully seated.