Huh!??
What does downloading a song onto your player have to do with it being red on wmp? Your question really isn;t thought out well.
Other details that you missed:
- rather than generally saying what you can't do (which is no help at all), you need to specify what you've been trying to do, how and what happens. Without that info, it's impossible to tell what you're doing wrong.
- what kind of player is this?
- are you sure it's an MP3 file? Not all music files are mp3.
did you use Limewire to get this file?