Me too! The homepage of the website I'm maintaining is http://www.lakestoland.org, which is what I entered the first time. After I subscribed, it bounced me to http://www.lakestoland.org/lakestoland.org, so I tried a few times to work around it - left it blank (same result) or just put the word "about" in the line (hoping it would land at http://www.lakestoland.org/about, but it just told me I needed a valid http address).
Thanks for any help you can provide!