Select a user to share with, and Mojo opens a browsing window. Songs you already have in your library are grayed out. Also, protected songs display in red. Check the checkbox next to the songs you wish to download. When your selection is complete, click one button and you\'re done. All the songs you have selected will be automatically downloaded and added to your iTunes library.
If manually choosing the music is too much work, try using the playlist subscriptions. Choose any playlist to subscribe to, and Mojo will automatically download and update the latest changes to that playlist anytime the other user is online.