How do set a song from your music library as your iPhone ring tone? I've been wondering for ages?

Just in case you were wondering, the song I want to use 'Teenagers' by My Chemical Romance!

There are ringtone makers from free to just a few dollars. Here's a couple.
https://itunes.apple.com/...29278?mt=8
http://makeownringtone.com/

  • Why won't the ring tone on my iPhone 4 work? I got my brand new iPhone 4 the other day and I keep trying to set a ring tone on it, and when I select the one I want and someone calls, it won't ring. It won't even vibrate when I put it on vibrate. Its brand new, never been used, so I don't think it could be broken. Maybe its on a weird setting. Either way, when someone calls or texts me, I won't know because I can't hear it.
  • What's a ring tone maker tweak for iPhone 5? I'm jailbroken on 6.0.2? I had it before but now you don't remember what app it was. It's a app that I didn't have to connect to the computer
  • What piece of music is the ring-tone from the iPhone 4 named Minuet? I've been looking for it everywhere but can't seem to find it by just searching Minuet, seeing as there are 50 million songs with the same name, thought someone might recognise it!
  • What is sheldon coopers ring tone? Have searched multiple variations of the question: what is sheldon cooper's ring tone on the Big Bang theory, and can't come up with it. Anyone know? Thanks in advance and pardon the brevity. Typing on an iPhone ain't easy.