After Removing the circuit board you will be able to see the backside of the set of function buttons.

Lightly push each of the six tabs away from the clips holding them in.

Make sure to unclip all the tabs before pushing the buttons out of the plate. All the buttons are connected as a set and trying to remove them one at a time will result in them breaking.

Once all of the tabs are loose from their clips, push the set of buttons down and out of the button plate.