The Live RSS tile shows you an overview of the rss feeds
From the live tile, you can open the feed items directly. To activate the app, go to apps management and activate the Live RSS tile. This can only be done by an admin.
There can be added two kind of feeds. Public feeds and a SharePoint feed.
First you have to give the new feed tab a name. This name will be displayed in the live tile.
The RSS feed URL can be retrieved from the website and/or SharePoint. Choose the Feed type matching your feed. And as last configure the Site url. Where the "Open site" links to. To remove or add a tab press the + and -.
Optional is to change the order of the rss tabs by clicking the arrow up or down.