I want to add a on/off switch to my pi 2 to correctly shut the pi down the switch I want to add this guy in a raspberry pi kik group made this code for me but he didn't explain how to wire it up. also I have no idea how to add the code to the pi. im running kali http://pastebin.com/WTeR39d8. I haven't tried to wire the or put the code in the pi because I do not know how to.