If you created your account using a birthday under 13 years old, you will automatically become a WeeWorld Jr user, and your account will be changed to a full account on your 13th birthday.

If your account has a birthday on or above 13 years old, contact WeeWorld and ask them to change your account over for you.

However, if your account is "underage", they will not change your birthday, and you will need to make a new account.