my tailgate locks up and i can't get it open on 2006 Buick Rainier

when the message rear is open

Asked by for the 2006 Buick Rainier
if you check on the inside tailgate panel there is a access hole pop it off, use a flashlight to see inside of hole lever on right, one on the left, use a couple of screw drivers push both levers up that should release your back hatch.