Nokia 5300

go into the gallery and select where you saved your music. Find the file you want to use, click options, scroll down to use tone, click set as ring tone.

You can also set up indivdual ringtones through the phonebook. Lookup the person you want to assign a tone to. Click details, add detail, tone, open gallery or tone downloads (where ever you put your music), find the file you want to use, click select.