Newest Metro Pcs Phone..help!!

I just bought the newest metro pcs phone. The ZTE C79. I am though having some difficulties. I bought the memory card for it so i can put music onto it, but how do I set the music as ringtones? When I go to the "my tunes" folder, its saying no file. But in the "my music" folder, it shows all my music, but no option to set as a ringtone. Only through the "my tunes" folder. How do I get the music into that folder, so I can set the music as ringtones? Please help! Thank you! -Lauryn

i work for metro... you need to format that card then the ringtone folders should pop up wen you plug it in the computer...oabreu