Ringtones Sanyo Katana Dlx

I have a Sanyo Katana DLX, how can I make my mp3s on the phone into ringtones?

I can put mp3s onto the phone by uploading them to the microSD card, but how can I make those mp3s be ringtones? I don’t have the internet on the phone so I don’t want to use the internet to get ringtones…if I did I would already have ringtones. Thanks.
I know how to make the actual ringtone, I want to know how to assign it as a ringtone on the phone. That is what I am trying to do. Thanks.

I have been asking this exact same question (check out my profile if you want). I have still been searching, that’s what I was doing when I ran across your question. As of yet, I haven’t been able to find any site that says how to do so. Sorry I couldn’t be of more assistance.