I just figured this out myself, so I thought I’d share for anyone else who might be wondering.
There are two ways to add a profile pic next to the comments you write here.
The first way is to sign up for a “gravatar”:http://en.gravatar.com/, which is nice because it works on any WordPress site as long as you use the same email address when you leave your comments.
The other way is to “register”:http://www.joshrenaud.com/family/wp-login.php?action=register on this blog and upload a pic to your profile.