Unplug the dryer from the wall outlet or turn off the breaker in your home's service panel.
Pull the knob off the front of the start button by pulling it straight toward you. Remove the spring from the knob post.
Remove the screws at the base of the front left and right sides of the control panel and rotate the control panel up.
Remove the screw securing the start switch, then disconnect the wire connectors.
Connect the wires to the terminals on the new start switch.
Align the start switch with the interior of the control panel housing and reinstall the screw to secure the start switch.
Rotate the control panel back to its normal position and reinstall the screws to secure it.
Reinstall the spring on the post, then press the start button knob onto the knob post.
Restore the dryer's power supply.