Location: Administration > Server > RSS
RSS (Really Simple Syndication, depending on who you ask) allows certain web browsers and specialized programs to automatically check for updates to a page.
Turn RSS feeds on
To enable RSS as administrator, go to Configuration and under Variables: Miscellaneous set enablerssfeeds to Yes. In v1.7 this option moved to the Server menu. Then in Configuration: Modules you can enable an RSS feed for each module. Finally, in the settings for each individual instance of a particular module you must enable the RSS feed and specify the settings (e.g. how many articles to display, what kind of article).
Note for using RSS in Forums
1. Enable RSS in Admin--->Server--->RSS:
2. Admin Page---> Modules---> Activites---> Forum---> Settings---> forum_enablerssfeeds=yes
This will enable the RSS option to appear in Forum properties of course. Creators of forums will still have to turn on RSS manually when creating a forum. Not all forums will automatically have RSS option displayed.
For 1.8+, the second step will be different. In Admin block, select Modules > Summaries > Settings (for forum) > Change forum_enablerssfeeds to Yes.
Subscribing to RSS feeds
To subscribe to an RSS feed from Moodle, click on the orange 'RSS' button and copy the address from your browser bar to your RSS reader software. Although most web browsers will automatically detect an RSS feed (IE7 and Firefox), Moodle does not seem to be sending them the correct information.