WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
Install the driver's side floor carpet retainer (1).
Fig 1: Installing Driver's Side Floor Carpet Retainer
Courtesy of GENERAL MOTORS CORP.
Install the passenger's side floor carpet retainer (1).
Fig 2: Installing Passenger's Side Floor Carpet Retainer