Hey guys I need to know if any one can help me with some wiring in my XH (ignition wiring)

Installing a start button!
I need to connect a wire to
* Terminal 15(ignition) behind the ignition switch
* Terminal 50 (behind the ignition switch aswell)
* and Terminal 15 (the power path that passes through the ignition
I don't know what Terminal 15, 50 or any of this is
Can any 1 explain or show me a picture of where these are so i can connect these wires tonight

Im so confused and I've googled this and looked on youtube but the only thing I could find was a step by step for a Honda!

HELP please! cheers