Basic How To Play Guide:
1.Install ArmA III
2. Ensure you have the latest game update.
3. Start Tunngle and join the "ArmA III" Tunngle Network.
4. Start your game, go to "Multiplayer" then change the connection mode to "LAN"
5. Join a game in the server browser, or host your own,
6. Have fun!
If you have any questions or need help you should head to the Tunngle forums.