"Register Your Child for the BK CrownTM/MC Birthday Club - It's Free!"
"If your child is under 13 years old, you can register them for the BK CrownTM/MC Birthday Club. That means when your child's birthday is nearing, you'll receive an email coupon for a free BK® Kids Hamburger Meal if your child's account has been validated and you've requested to receive it on the child's behalf."
Click on "Create a Parent Account" in the upper left:
"We've sent you an email that contains a verification link. Please check your email in a few minutes and click on the link to complete your registration at BKCrown.com."