I want to set a sound recording on my iphone as a ringtone but I can't figure out how?

I looked it up and it said to change it to an m4r on your computer and copy it to your iphone via USB and I can't get it to copy to my phone. Anyone know how to do that? I tried just dragging and dropping it but it wouldn't let me drop it. Or a different way to make the sound recording into a ringtone?

Added (1). also, when I click on the file my computer lists it as a ringtone, but it doesn't show up in the Tones file on iTunes either. It does show up in iTunes on my computer though, just as a song I guess

On E-how, the are detailed directions. I have fine this a lot- just not lately - so you will get better directing from them.