I don't fully understand your question, but to cover the basics.... you download mp3 files from a website (maybe iTunes) and these are saved on your computer's hard drive. (If you already play some mp3 files using Windows Media Player, then you do have some mp3 files on your hard disk.)
To play these files via your mp3 player....plug your mp3 player into your computer. (It will probably have a USB connector, so plug it into one of your USB ports.) Then your computer will see that you have done this and an extra drive will appear in Windows Explorer. (If you usually have just A: C: and D: drives you might see a drive E: appear.) This additional drive represents the storage area on your mp3 player. Simply copy the mp3 files that you wish to play from their normal folder to the drive which represents your mp3 player.
TS
June 2005