Turn off the main switch at your breaker box to ensure that no power is going to the switch or fan.
Remove the existing light switch plate by removing the screws with a screwdriver.
Remove the screws holding the switch in place and pull it out of the wall. Loosen the terminals holding the wires in place with the screwdriver, pull the wires away from the switch and remove the switch.
Connect the wires to the new Broan switch by matching the colors to the proper terminals. The black terminal is located near the top while the white and ground terminals are located near the bottom.
Tuck the wires into the wall and secure the Broan switch in place using the screwdriver and supplied screws.
Attach the switch plate using the screwdriver and supplied screws.
Turn on the main switch at your breaker box to restore power.