What Frag said is what you need to know.
Read the top of our doc, it includes gif that show you how to invite each other.
If it doesn't work then make sure your firewall isn't blocking anything and also the one who invites the other has to port forward port 3074 (UDP) on his router, that's it.
If you still need help you need to provide info, like a screenshot of your port forward rule
undefined
