I used Bitpim to transfer my ringtones to my Versa. It was actually pretty easy to do also and I prefer it over texting. I saw a method in another thread which involved going into the filesystem, but that didn't work for me since it didn't show up in my ringtone list.
What I did was I clicked on the far left icon in Bitpim (Get Phone Data). Once that was done I went to Media > Ringers and dragged my mp3's straight into the window. After that, I clicked on Send Phone Data (To the right of GPD) checked only the ringtone box, set it to Add, and pressed ok.

And bam, I had Three Days Grace's Riot on my list

I tried to make this as clear as poss. so I hope it works Gl!