I have heard some people are having problems leaving comments.
Here's how: Click where it says "1 comments" under the pic you want to comment on.
If you have a yahoo, Google or AOL account you can use the Google/Bloggor and type your ID and password. If not you need to select "Name/URL". Type in your name. Don't forget the Word Verification. Just type what letters you see! This is to keep automated computers from posting on the site.
Hope this helps!