To open the liftgate, press the trunk/liftgate button on the remote keyless entry transmitter or the remote trunk/liftgate release button located on the lower edge of the driver's door. See "Remote Trunk/Liftgate Release" under Trunk .
If the liftgate is unlocked, you can manually open it by pressing the touchpad located on the underside of the liftgate trim panel, to the right of center.