Q. I do not have any email address. What should I do? An email address is a requirement to use the Yu ID. I’m sorry but please create an email address and register. Related articles Q. How do I register for Yu ID? Q. Do I have to fill in the items, such as the landline phone number, that is not marked [Mandatory] on “Your profile registration” screen? Q. How do I change the information registered to my Yu ID (your profile)? Q. I cannot complete my initial registration. An error message such as “Contains invalid characters” or “Incorrect format” is displayed when I enter the email address for registration Q. How do I view the login history?