To do that, click on the User Control Panel near the top of the message board. This should take you to it:
http://www.faithwriters.com/Boards/phpBB2/ucp.php
When it opens, click on the Profile tab. Scroll down to the bottom of that page, and you'll see the birthday section. You don't have to add your year (I don't think).
Once you've done that, we'll be told when it's your birthday.
Too easy!

Love, Deb