how can i use my mp3 songs saved on my W760 sony ericsson phone as ring-tones?

how can i use my mp3 songs saved on my W760 sony ericsson buzz as ring-tones. The songs i have saved on my memory card can be read but for some reason when i try to use the songs as a ringtone the buzz say’s that it cannot use the file. what do i need to do? in peacefulness for it to use my mp3 songs as ringtones

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