Changing old Apple ID to new ID on IOS

I had the same issue as below, but when I follow these steps to delete old Apple ID on my iPhone, I am prompted to enter my old Apple ID password to turn off Find My iPhone. My old password does not work. Please advise. Thanks!

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How do I update my Apple ID email address on iPhone and iPad after changing the email but not password. I have verified my new email on iPhone iPad and iMac but settings on all for iCloud still show my old email address. I can't use anything now that needs my Apple ID

This solved my question by pedro d on Sep 24, 2013 3:08 PM

Hello there, Chivs86.

From what it sounds like you are wanting to sign out of iCloud with the "old" ID and sign in with the new. The following Knowledge Base article should help you with that issue:

iCloud: Features that work with one account at a time on iOS 5 and OS X Lion or later

http://support.apple.com/kb/TS4020

Specifically:

To change a secondary account to a primary account

iOS 5 or later:

1. Tap Settings > Mail, Contacts, Calendars.
2. Delete the secondary account.
3. Tap the Back button.
4. Tap iCloud.
5. Delete the primary account.
6. Add the secondary account that you want to be your primary account.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro D.