It is recommended (but not required) that you register before posting comments. Here are two links you may find useful.
Click here to register and post comments in the blog. This login information will only be valid for the I Am The Blog site.
Click here to choose a Gravatar, a “globally recognized avatar” that can be used on a variety of blogs and social networking sites like this one, other sites that use WordPress, etc. After you confirm your email address, all your future posts on here should display your avatar (instead of the default profile image).