Change everything from localhost to your own ip-adress
and forward all ports (for example login server port, world server and master server port)
in your router settings (type your standard gateway 192.168.x.x in the browser url and search for port forwarding)
Then edit the Ip-adress of your client with Hex-Editor to your own or use the Multiclient Creator [
Send the client to your friends and let them join.