An RSS feed is a way to access information from website without needing to visit that website regularly. Each of the blogs provides an RSS feed. The method for using feeds is browser-specific, but while the browser is viewing a blog the option for the feed is available.
The feed offered by the main blog menu page is similar, but will provide updates from all the blogs on that page, rather than just one, which is what is offered when you are viewing a particular blog.
To manage your subscriptions see Subscriptions
The following note corresponds to a feature which is not available at time of writing.
A future aspect of the RSS feed is the ability to encode user details. This means that when an item appears on the feed, clicking will automatically log you in to read the posts. This is possible because you were logged in to the blog when you added the feed.
However, your details will be encoded in the RSS feed's URL. Passing this URL to someone else will then allow them to log in as you. You should be careful not to do this.