To subscribe to all the forums at stream-recorder.com you can use the followin link:
http://stream-recorder.com/forum/external.php?type=RSS2
To subscribe to a particular forum, you should use a different URL. For example, to subscribe to the Video recording forum you can use the following link
http://stream-recorder.com/forum/ext...SS2&forumids=4
RSS management is pretty easy if you have the FireFox browser. You just enter the forum you need and then clock onto the News feed icon in the address bar. Then you can select whether you want to subscribe to all the forums or only to the selected one.

Please let me know if you need any more help.