Installing a feature set is very much like installing a package from the Unity registry, except that you look for feature sets under the Features expander, rather than the Packages expander:
Open the Package Manager window and select Unity Registry from the Packages drop-down menu.
From the details view, click the Install button.
When the progress bar finishes, the feature set and all its packages are ready to use.
Click the QuickStart link in the top right to discover more about this feature set and how you can use its packages together.
Note: If you need to remove the feature set, open the details view and click the Remove button.