All WordPress blogs have open comments on all pages and posts. if they aren't open then you closed them. However, the site linked to above is not a free hosted WordPress.COM blog. WordPress.org and WordPress.com are completely separate. We don not provide support for that site here.
If you don't have a username account at WordPress.org, click http://wordpress.org/support/ and register one on the top right hand corner of the page that opens, so you can post to the correct support forums for your software.