Leave a Reply Box Not Appearing

Hi:

On our blog at http://www.stopsexistremarks.org/, we intend to have many of our pages set up to allow comments. On “Edit Page,” for these pages, I’ve checked the box “Allow Comments,” but when I visit the site, there is no box to leave a reply. See the following page, for example: http://www.stopsexistremarks.org/post-your-ideas-for-responding-to-sexist-remarks/. How do we get the Leave a Reply box to appear?

Thanks for any help.