Apple ID
One person has an Apple ID for an iPhone and a different Apple ID for an iPad. How do you repeal one and replace it with the other so that both devices have the same Apple ID
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The simplest solution is to sign out of the one ID and sign in with the other.
Read this document to learn how to sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac --> Sign out of iCloud on your iPhone, iPad, iPod touch, Apple TV, or Mac - Apple Support
Click on this link to learn how to sign in with your Apple ID --> Sign in with your Apple ID - Apple Support
1. Open the Settings app.
2. Tap Sign in to your [device].
3. Enter your Apple ID and password.
4. If prompted, enter the six-digit verification code sent to your trusted device or phone number and complete sign in.