You have obtained the URL of the Atom feed from the provider of the feed.
In the ABAP Development Tools, you can subscribe to any feed that is published in Atom (Atom Syndication Format) or RSS (Really Simple Syndication) format.
Your Atom/RSS feed appears in the Feed Reader. Click on an entry in the feed for a quick look at the content in the right frame of the Feed Reader view. Double-click on an entry to open it in its own window.