Go to scene by xbox controller button press script.

Hello guys. I am making a unity game for the xbox, but im having a problem. I have looked for scripts and tried to make my own, but cant figure it out. How can I make it to where when the player taps the "A" button or "B" button or whatever, they will be sent to a scene? (Note: This is for a main menu.) I really don't expect you guys to just give me answers, but can you please help or end me a link or even a script?? It would really be appreciated! You have no idea how long ive looked into this! Thanks guys!