Turn a youtube video into an iPhone ringtone?

I want to turn a video into my text ringtone for my iphone (i have the 4), so i looked it up but can't get it to work. I converted the video to an mp3, and clicked create AAC version, and renamed it as an.m4r (from mra). This is the ringtone format that many websites said worked, but i could only get it to show up on my phone as a song, not a ringtone.

Is there any way to turn this video into a ringtone?

Any help, or links to instructions are appreciated!

Convert it to an mp3, then go on your phone or computer (phone is easier to me) and download the app 'myxer'. Follow the directions and use your mp3, then you'll get it! Just follow the myxer directions and you'll be good!

Read this tutorial: Turn YouTube Videos Into Ringtones For iPhone or Android Phones, then you can find the answer.
http://www.ifunia.com/blog/turn-youtube-videos-into-ringtones-for-iphone-or-android-phones/