How does it work? Either add feeds manually using the "+" button or drag the feed from your web browser onto the feed view. The rest should be self-explanatory. The only non-visible UI shortcut is that command-number shortcuts can be used to navigate the feeds.
Please note, this is a very early beta release. The UI is far from perfected and numerous planned features are not present. Support for smart feeds, groups, and advanced appearance prefs is forthcoming.