If you are already a WordPress.com member and have logged in, you’ll find that submitting a comment is very simple. But if you are not using your full name in your WordPress profile, then I can’t approve it. (In the case of a few people who have submitted comments using their real names in the past, I’ve done it for you.)
Assuming you don’t mind using your full name (otherwise, why would you by trying to post something at Media Nation?), there’s a simple solution. Go to your WordPress settings and click on “Public Profile.” Now you can change your “Public Display Name” to your full name.