You have to set up port forwarding in your router configuration. Example: Your local IP is 192.168.1.10 and your router IP is 236.64.39.10. Then you have to forward your public IP:Port 236.64.39.10:30000 to your local IP:Port 192.168.1.10:30000. Now the server list can "see" your local server. The server list in Stonecraft doesn't list local servers.