You have to put your email address in the about section, the email field is for "Please put a valid address in the email field, or we won't be able to send you

You have to put your email address in the about section, the email field is for "Please put a valid address in the email field, or we won't be able to send you a new password if you forget yours. Your address is only visible to you and us. Crawlers and other users can't see it."