Another, usually larger, image is known as an avatar and is generally unique or personal to each user.
Within your User Control Panel, under “Profile” you can add an avatar by using one of the four following methods: Gravatar, Gallery, Remote or Upload.
If you were sent an email, follow the instructions.
If you did not receive an email, you may have provided an incorrect email address or the email may have been picked up by a spam filer.
It is up to the board administrator to enable avatars and to choose the way in which avatars can be made available.