First, you all need Download Radmin VPN to connect in one network with your friends with Radmin VPN and agree on who's going to host the game.
Then the host should go to:
Play -> Multiplayer -> New game for the first game or Load game if you've played before.
Click "Generate" and "Play"
So now you have the game and the host in it.
To join the game you need to go
Play -> Multiplayer -> Connect to game
and there you need to put a host's IP address.
And press "Connect"
Now it should work!
