Your iTunes needs your Apple ID to access its content and purchase music online.
Do you know Apple ID? Do you already have an Apple ID?
Are you on your computer or iPad?
After you verify your email address, you can sign in to the iTunes Store, App Store and other Apple services such as iCloud with your new Apple ID.
Are you saying something happened on your iPad?
If you still have issues, please click this link to create your Apple ID from Apple website.