This is the text needed to add a simple RSS Feed into XBMC (I deleted the information by mistake so thought that I would add it here for future reference. I have used the BBC News RSS Feed (Shown Below)
Just locate the file @ \XBMC\userdata\RssFeeds.xml and paste the following code into it:
- http://newsrss.bbc.co.uk/rss/newsonline_uk_edition/uk/rss.xml