On the top right, you have a bar where one of the options is "PROFILE". If you click on it, you should see your statistics and to the left, you will have a menu where one of the options is "Forum Profile Information". If you click on it, you should get the page where you can fill in the dates. Then click the "Change Profile" button at the bottom of that page.
Yeah, for some reason, I am unable to see any other setting besides "Account Related Settings." I followed people's suggestions to the T. I took a screenshot, but can't post links on the forum. I guess I will attempt to find an administrator.