Use the flat end of a spudger to gently push the volume button board away from the frame.

If the volume button board begins to bend significantly, stop and pry from a different angle.

Continue prying until you loosen the volume button board from the frame.

To reinstall the volume button board, cut a small piece of adhesive from the pre-cut adhesive card or a roll of Tesa tape, and use it to stick the board back onto the frame.