To leave a comment you must have an account/password at google (the easiest), yahoo, or twitter. Follow these steps to post a comment:
1.Type in your comment (highlight and save it just in case something goes wrong)
2. There is a box that says "Comment as" -- either select Google or select OpenID
3. If you select OpenID it will ask you for its url -- simply put yahoo.com or twitter.com
4. Then sign in using your google/yahoo/twitter account and password
Then you should be able to post your comment
It sounds difficult but it really is pretty easy. Thanks for putting up with this. The alternative is to make the site totally open and I am afraid none of us would like the security issues involved with that option.