Insert the point of a spudger between the motherboard and the left side of the button board.

Use the point of a spudger to push the button board out to separate the adhesive securing it.

Grip the board itself with blunt nose tweezers and remove it.

If you're reusing your board, the leftover adhesive should be sticky enough to adequately secure it.

If your new board comes with pre-installed adhesive, remove any linings and use a spudger to press the board into place.

If your board doesn't have adhesive or the leftover adhesive isn't sticky enough, use strips of thin double-sided tape such as Tesa Tape to secure it.