Installing additional software
To install additional software on your service click on the Add more
link in the sidebar
You should now see a new popup open where you can select the game or service you would like to install. If you don't see the application you would like to install click on the Install something new option
If you clicked on install something new, you will now have the option to search for the application you would like to install, once you find the application you would like to install select it and click on the Install button.
Once the software has been installed you will get a notification saying it has been installed and you should now be able to see the software in the sidebar under Games & Software, if you do not see the software you have installed try logging out of the panel and back in to force the panel to retrieve the latest information.