When you join the awesome MovieStarPlanet community and are under age when you try to use a social feature you will be asked to sign up your parent's E-mail.
Talk to your parent/legal guardian for permission to be able to use MovieStarPlanet social features and share with them this article about what the Parental Control Center is.
When you sign up their email address for permission they will receive an email to grant you permission and be asked to sign up for a Parental Control Center where they can help you manage your accounts and access till you are old enough.