WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Install the insulator to the hood.
Fig 1: Installing Hood Insulator To Hood
Courtesy of GENERAL MOTORS CORP.
Align the insulator retainer holes to the holes in the hood.
Install the push-in retainers to the hood insulator.