Launch Arma Reforger
Click on the Multiplayer option
Click the Direct Join option
Enter in Your server's IP in the IP Address option
Enter in your server's Port into the Port Option
Click the Continue Button.
Your server's IP and Port are shown in the Connection info of your server's control panel.
If your connect info shows: 104.192.227.54:7930
Your IP would be 104.192.227.54 and your port would be 7930