You just have to install the server and client, start both, forward the
UDP Port 9987 in your router to your computer's IP and grant the server full access to the internet in your firewall.
Then you should be able to connect to your server with your local IP
127.0.0.1
Others have to use your external Internet-IP which normally changes every 24 hours. To find it look into your router or just use this Website:
http://whatismyipaddress.com/
You could also use the public server, if it isn't full to chat with your friends, that would be the easiest way
