How do I remove the upper back rest on the rear seat? on 2001 Buick LeSabre

Upper back rest on the rear seat is noisy when driving. How do I remove it to make repairs? Lower seat is easy to remove.

Asked by for the 2001 Buick LeSabre
Useally there are bolts at the bottom of the back rest that need to be removed or it has a metal frame that fits in 2 slots. The later requires some strenght pulling up at bottom of seatback to release. In both cases the bottom chusion needs to be removed first.