How do I add an icon to an author bio?

Simple question, or so I would think. How do I do this please. I want to add a image to this post here -

http://mymostvisited.com/about-mmv/

 

You can use this php code <?php echo get_avatar(get_the_author_email(),60);?> to echo out the avatar of author. It will use gravatar email to display the avatar.

 

Where would I use this code please?

 

add that code in page.php or maybe you will be having a about.php page. There will be a div like this <div class="author-overlay"></div>
add that php code inside that div

 

So that would happen only when people are logged into WP? Is that correct?

 

No, the email address must be registered on gravatar.com and should have an image uploaded for the account

 

Thanks for the info'.