Q: How does one change Apple ID on iPad?

1. Please don't ;post your email address in a public forum unless you want tons of spam.

2. There's 4 places on an iPad where an Apple ID is used.

Settings->iTunes & App Stores->Apple ID

Settings->iCloud->Apple ID

Settings->Facetime

Settings->iMessages

Sign out of all 4 places before doing anything else.

Then go to http://appleid.apple.com , and Sign in with the current email and password combination. You can then edit the E-Mail address being used.

When you are done, sign back into the 4 places on the iPad with the new email and password combination.

Change your Apple ID - Apple Support

Hi

Follow the steps here:

Sign in with a different Apple ID on your iPhone, iPad, or iPod touch - Apple Support