Use the web uploader to quickly get some songs up. Just click the upload button located in the bottom right corner of the player.
Better yet, use the Mac or Windows iTunes Desktop Uploader to automatically upload your song library, playlists, and play counts. It will upload songs with the highest ratings and play counts first while automatically managing your upload speeds to ensure a smooth internet experience. To download the uploader, click on the "iTunes Uploader" button in the top right corner of the site.