While browsing in FeedDemon, you may notice the 
feed auto-discovery toolbutton light up on the browser toolbar. This means that the current web page contains a link to an RSS feed that you're not subscribed to.
Clicking this toolbutton displays the subscription wizard, enabling you to quickly subscribe to the feed. Clicking the arrow to the right of the toolbutton will display a list of feeds if more than one feed is discovered in the current page.