WARNING: This page is about a different car, the 2008 Isuzu i-370, 2008 Isuzu i-290, 2008 GMC Canyon, and 2008 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Rear Storage Compartment
Courtesy of GENERAL MOTORS CORP.
Remove the 2 bolts securing the rear storage compartment to the floor.