RSS and Feedburner Links Not Working

Neither the links in the logo bar nor in the widget work, although I have managed to get the Comments link to work. I have also gotten the code from Feedburner posted into a Text widget in the sidebar to work. When I click on the RSS feed I get a "invalid feed request, error 400" message. I am sure I need to put my RSS url into the code but I can't find where. I did manage to get the Comments icon to work.

I would just as soon remove the widget and get the links in the logo bar to work. Where do I need to put my URLs in the code?

Thanks