How to installed a 4 wired or 2 wired key switch on a Honda CRF450X?

Can Someone tell me how to installed a 4 wired or 2 wired key switch on a Honda CRF450X?

The small wire going into the ignition coil -
Cut that wire and extend those 2 ends to your 2 wired switch.
Key on - the switch will allow the coil to receive a signal from the engine telling it when to fire.
Key off - no signal, engine no run.