This is easy, it works exactly the same as any other joomla extension. Login to the backend and go to Extensions -> Install/Uninstall, browse to the zip file and click  the Upload File & Install button.

1. log in to the backend of your website (/administrator)

2. In the topmenu select: Extensions -> Install/Uninstall

3. Click the Browse button and select the extension package on your local machine.

4. Click the Upload File & Install button.