Hi Dale,
You have to log into your user profile. If you click on your name you should be transferred to another page - your profile. Right under your name is a bar that had "edit user profile" in it. Click that, and you will be transferred to a page where you can change your time zone and add an avatar. I have to check with Warren about the avatars... I just checked mine and there's no way to change it, so don't panic if you can't add one. I know he just updated the coding, so that may have gotten missed.
R