Add the following HTML within the <head> of the document:
<link rel="alternate" type="application/rss+xml" title="YOUR SITE TITLE RSS Feed" href="URL TO RSS FILE" />
eg: <link rel="alternate" type="application/rss+xml" title="Northlink Ferries Disruptions RSS Feed" href="http://yoursitehere.sitekit.net/rss.aspx?id=12345" />