Turn off the power supply to your Frigidaire washer, and unplug the unit.
Open the door of the washer, and remove the metal clamp ring from the doorway with your needle-nose pliers.
Push the right side of the rubber seal in the doorway back so you can access the door switch assembly.
Remove the mounting screws from the assembly with your Phillips screwdriver.
Unplug the wiring harness from the assembly, and remove the assembly.
Plug the wiring harness into the new door switch assembly, and fit it in the compartment.
Replace the mounting screws.
Fit the seal back in the doorway, and replace the metal clamp.