WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Remove the screws (2) from the fuel tank filler pocket.
Remove the gas cap.
Remove the fuel tank filler pocket (1).
Fig 1: Removing Fuel Tank Filler Pocket With Screws