Changing Apple ID on iPad to match Apple ID on iPhone
What part of the iPad do you want to add a new Apple ID to? There are several different places to enter an Apple ID.
Messages
Settings > Messages > Receive at:
App Store
Settings > Store > Apple ID:
Alternatively, you can go to the App Store, click on "Top Charts" at the bottom. Scroll to the bottom and you can sign out and enter a new Apple ID.
iCloud
Go to Settings > iCloud > Account:
