You will need this to subscribe feeds to your google personalize home page or your google feedreader:
Take the above url minus the information after the equals sign, copy it and paste it to a new window or new tab's address/location box in your browser, then add the url for the feed you are subscribing to to the end so that it looks something like the url above.
So let's say you were going to subscribe to my feed. Copy:
http://www.google.com/ig/add?feedurl=http://feeds.feedburner.com/crusaderx and put it into the address/location box on your browser and hit enter. It will take you to a page to chose either the personalized home page or the feedreader.