If you have itunes on your computer when you plug in your pod it should recognize it and sync the music. If not you may need to use the function in itunes that selects a media player.
It resides in itunes in a named playlist. I'm the administrator on my PC machine. I've read the manual which wasn't a lot of help in the actual uploading in the Ipod. I've looked everywhere on the itunes site for the 'change media player' to no avail. I guess I'm not that savy with MAC language yet...