Burner had no temperature control other that full on.

Locate and open appropriate breaker to kill power to the range. (very important if you intend to see tomorrow).

Pull off the control knob.

Remove 2 screws that hold in control pannel.

Lift out the control pannel to the extent that the wires will let you. (2-3 inches)

Remove the nut that holds the switch/controller in the pannel.

Remove the wires one at a time and reconnect them to the new switch. Make sure to connect them the same way on the new switch.

Re-install the switch in the pannel.

Re-install the pannel in the stove.

Close breaker and test burner contol.