iPad Basics: How to Change the Apple ID on the iPad | iPad
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How to change your Apple ID and email address | iMore
How to Change the Apple ID on the iPad - MacTip Your Apple ID is a crucial component of most of the systems and services you’ll be regularly using with an iPad, or any iOS system really. It synchronizes system settings between devices, stores payment information, lets you access FaceTime from non-Apple devices, and quite a lot more.
How to Change Apple ID to iCloud Email Address
Change your Apple ID - Apple Support