To mark your existing dashboard as Favorites perform the following steps:
1. Select the dashboard that requires to be marked as favorite from the dashboard selector or click the Manage Dashboards menu.
2. If you select dashboard selector from the All Dashboards or Frequently Used select the star icon
2.1. If you click the Manage Dashboards menu, select the star icon from the list of dashboards.
3. A pop-notification at the top-right corner of the screen generates that notifies the dashboard has been successfully marked as favorite.
Dashboards marked as favorites are listed in the Favorites tab.
The following screenshot is an example that shows the list of favorites dashboards in the Favorites tab: