After selecting your course, on the 'Round Setup' screen tap 'Add Player'.
On the 'Add Player' screen, you can add new players by tapping the 'Add Player Icon' or selecting them from the existing buddies.
If you are adding a new buddy you have to fill his details and tap the 'Check Icon' (top right) when you're done.
Your buddies will appear on the 'Round Setup' screen so you can check that everything is set correctly before you start your round.
Note: Email is required in order to automatically send the round scorecards to your buddy.