How to change a song I bought on iTunes into a ringtone?

So I'm using this website:

http://mashable.com/2013/08/08/free-itunes-iphone-ringtones/#gallery/itunes-ringtones/52129368b05f9d647d0003e2

And it was all working well on iTunes, I'm using a Mac, and then I got to step seven, which is going to tones and your song will be there. My song isn't there. I did everything how it is supposed to be, and I'm on iOS 7, by the way. What do I do to make my ringtone come up? I'm getting really frustrated and all the tutorials I've seen don't show my problem…

I can't tell you what to do. But it'd be easier if you just bought the ringtone version.

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