Could you confirm the URL for the site to which you refer? The site linked in your question is using the 2012 theme, so I’m guessing that’s not the one giving you trouble.
You might also check to be sure the site you are having trouble with is hosted on WordPress.COM. I suspect you are having problems with a self-hosted WordPress site. Here’s the difference: http://en.support.wordpress.com/com-vs-org/
If you are having trouble with a self-hosted site, I’m afraid we can’t help you here, but the nice people over in the WordPress.ORG forum would be happy to help:http://wordpress.org/support/
If your site is hosted here on WordPress.com, just provide the URL, and we’ll be happy to help you figure things out.