How to change email on your IPad
How to change email on my IPad
iPad 2, iOS 9
Question marked as
Your question is somewhat ambiguous. Are you attempting to use a different email account with your iPad - or are you instead trying to change your AppleID? Something else?
You can add or remove email accounts from iPad settings. The procedure is described within the iPad User Guide:
Add and remove email accounts on iPad - Apple Support
If instead you wish to change the email address that identifies your AppleID account:
Change your Apple ID - Apple Support
Change your Apple ID password - Apple Support
What to do after you change your Apple ID or password - Apple Support