On the main menu of the game select join game

In the server name filter outlined in red type nodgs

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After you entered the name in the filter box you should see the server NODGS Galactic (Reforged Eden) in the list. 

Once the server named NODGS Galactic (Reforged Eden) shows up in the list you can click it and click connect.

If you do not see the server listed in the listings you can connect through Direct IP and port. Start by clicking the box next to Direct IP and Port and enter the following

nodgs.ddns.net:30000

Once you have entered the information for Direct IP and Port you can then click connect to connect to the server.