The game code is currently only available for our corporate users.
The best way to start is to get everyone to download the app and register a profile, then, through your own profile follow these players. You can then create the game and add the other players easily.
When you create a game and add players, the player will get an email notification and will also be able to see that game from their profile, so they will not need a tournament code to access the game.
Please do take a look at these videos that will explain the app features a little more:
How to invite a friend: https://www.youtube.com/watch?v=jRETJ4DVSWk
How to create a game: https://www.youtube.com/watch?v=qMd3OSLvVSo
How to Use GPS: https://www.youtube.com/watch?v=ygZvcUss_pU
How to score a game: https://www.youtube.com/watch?v=gpkGRLbTfxw
The interface has changed slightly since making these videos, but this will give you a good idea.