Turn off the dishwasher breaker in your home's service panel.
Pry the old detergent door off of the dispenser using a flathead screwdriver. Gently insert the screwdriver between the soap dispenser door and the bottom-edge of the dispenser. Pry the lip of the door up and off of the dispenser to remove the door. Use care to avoid damaging the soap dispenser finish.
Position the replacement detergent dispenser door above the dispenser, and then connect the spring to the spring post on the underside of the door.
Snap the new dispenser door onto the front of the dispenser.
Restore power to the dishwasher upon completion of installation of the new detergent door.