Step 1: Remove the screw that fixes the motor cover, find the corresponding power switch that needs to be replaced, unplug the AC wirefrom the switch, unscrew the screw that secures the power switch, and take off the power switch.
Step 2: Replace the new power switch and install it properly, plug in the AC wire of the power switch in correct order, close the motor cover properly, and tighten the screws that fix the motor cover.