To get the RSS feed of the latest discussions and replies in your Forum, head to the Forum page and scroll to the bottom to find the “RSS” icon. Right-click the icon and copy its link location or click on the icon and copy the web address of the page that opens.
You can get even more specific and follow only discussions in a particular category or even only discussions with a particular tag by grabbing the feed’s link from the appropriate page.
To start getting updates with RSS, go to your external website or feedreader of choice. A good place to start is iGoogle, which is easy to configure and comes with a bunch of default feeds that will give you an idea of what you can use RSS for. To add a feed to your iGoogle, click the “Add stuff” link at the top right of the page. Next, at the bottom of the left column, click the “Add feed or gadget” next to the RSS icon.
Paste in the URL of the RSS feed you copied from your Ning Network and click the “Add” button. Once your feed has successfully been added, click the “Back to iGoogle home” link at the top left of the page. Your new feed will appear in the top left corner of the page.