It is always good to add the servers you play on to your Steam favorites. That way you have easy access to all our maps in the server browser. This is a small guide on how to do this.
First you open your Steam client and log in, click on "View" and select the menu"server".
Next switch to the "Favorites" tab and click "Add a server". The best way is to copy and paste the Server IP from the guide on how to join the server.
Enter the IP into the text field and click on "Add this address to favorites"
Make sure that your server filter in ARk is set to Favorites.