1. Start the game
2. Click "PLAY"
3. Click "PRIVATE SERVER"
4. Press the "E" key
5. Type / Paste in your "Connection Info" IP:Port
   
   For Example, for our test server it would be 51.89.153.4:50501 as shown in the images below:
   
   
6. Press the "Enter" key.
7. Double-click your server or click it once, then press Enter - you will join the server.