Disconnect the refrigerator's power by removing the plug from the outlet. Pull the drip tray out as far as it will go and press down on the catch to release it from the housing.
Remove the screws holding the housing to the front of the freezer door revealed by removing the drip tray. Pry the housing off starting with the bottom edge then pull it off the door.
Unplug the wiring connections from the back of the housing leading to the control panel and the ground wire. Set the old housing to one side. Connect the wires to the back of the replacement housing.
Snap the housing back into place on the front of the freezer door and replace the screws. Slide the drip tray back into position and re-connect the power to begin using the new panel.