WARNING: This page is about a different car, the 2005 Chevrolet Optra5 and 2005 Chevrolet Optra. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Liftgate Support And Studs
Courtesy of GENERAL MOTORS CORP.
Raise and support the liftgate in the open position.
Unscrew and remove the liftgate support from the liftgate and the body.