How to set iPhone ringtones I bought? - 1

How do I set iPhone ringtones I bought?
I went into the iTunes store and bought two ringtones and when I went to my list of ringtones on my phone they weren't there but I do have them as songs in my phone, also this is the iPhone 4s if that helps.

Plug the phone into the computer with the itunes and sync the iphone. If that doesn't work double check if you ever really purchased the ringtones or just the song.

You're supposed to sync it to your computer and I think it'll turn up in the "Tones" icon, and then you click on your phone and stick whatever ringtones you had inside "Ringtones" I think.