IIRC you can upload from an SD card, Ipod or direct from cd. You just can't upload from an mp3 player.
After plugging in/loading your media source, just go to extras and follow the menu from there.
**if using an SD card, be sure to format it before loading your music on it as some have had problems loading from an SD card, I have not, but I also make sure to format my cards prior to use.**