you can either go to START then go to VOICENOTES just hold your phone to a radio to the part that you like and RECORD. after recording is done go to the title and highlight it. go to menu and then SET AS A RINGTONE..
OR YOU CAN
hook the computer up to your phone on the cradle then open up MY COMPUTER FILE then MOBILE DEVICE then MY SMARTPHONE then STORAGE then grag wav files to SOUNDS file