The only way to reset your Date of Birth is to contact Customer Support, and request that it be reset. Then the next time you sign in, you will be asked to set your Date of Birth again.
Please make sure that you use your real Date of Birth, so that you do not forget it. Your Date of Birth is used to help secure your account against unauthorized access, as well as to perform changes to your account like setting a new email address or password.
Your Date of Birth is not displayed anywhere on our site, and is never shared with anyone, so it is safe and secure to share that information with us.