Marking your favorite servers in ZenMate is one of the best ways to customize your experience with the VPN app.
How to add favorites:
Start the VPN app and expand the interface into the advanced mode as shown below.
By default, you will be shown the list of all ZenMate available locations. On the right side of the list there's a star button which you need to click in order to add a server to your favorite list.
*Note that you can remove a server from the favorite list the same way you've added it, by clicking on the star icon in the list.
Once you've added the servers to favorites, they will show up in the main screen's server list ff you click on "best server location" as show below.