Adding an RSS feed to Feedly is a straightforward process that can be done by either searching for the feed or manually pasting the URL into the service. The easiest way to add a new site is to search for it, which will display a list of results with a search bar at the top. From there, simply click on the correct result and follow the prompts to add the feed to one of your Feedly folders. Alternatively, if the site is not in the directory, you can manually paste the URL into the service to subscribe to it. This process allows users to easily keep up with their favorite websites and discover new content.