I went to your site and noticed a few things. First you only seem to have part of the code in your template file as evidenced in the attached image (circled in red):
Secondly I noticed (in the about the author section under your posts) that you don't have a gravatar showing there as it should be...do you have an account setup at gravatar.com? That code is set to work in conjunction with an account from gravatar.com and you need to use the same email address on your blog as you do when signing up at gravatar.com.
The third thing is that I see your site is setup with a static page as your home page. So I assume your using a template for your blog posts...try adding the code there.
You do not have the required permissions to view the files attached to this post.