So.............I have an mp3/wma/rec that

so.............I have an mp3/wma/rec that I believe is a sony and have lost the directions for it. I cannot figure out how to make it play. I can turn it on by pushing the play/pause button and holding it down for a few seconds until the little signs come on and I can navigate the signs however cannot get any of the content to play. I can put it in the usb port of my computer and see that the material is on the mp3 but I want to play it on my mp3. Help!!