Help Using FeedBurner for Coming Soon Widgit

I have installed the Coming Soon page widgit and it's activated; but I'm having trouble setting up Feedburner. On Google FeedBurner it says I have to enter a valid Feed url, but the page that the coming soon page is on is the main Page of my site, not a "feed" page, whatever that is. Is there a fix for this? Or can I just enter custom code to let people join my mailing list (which I think would be more ideal; I don't need all the bells and whistles feedburner has). Thanks