You have to set up a "smartfeed" with the username of the person you want to follow in the blank box next to "Title contains." A smartfeed will follow a specific person across all of the RSS feeds that you have set up in Feedreader. There is currently no way to have an RSS feed for specific people, but I have requested to the IHub admins that the feature be added to the site. They responded back that it was a good suggestion. I guess we'll see if it gets implemented.
News 
Market Data 
Discover 
