I've just update to IOS 8. But I enter wrong Apple ID in Icloud setting. How can I change it?

I've just update to IOS 8. But I enter wrong Apple ID in Icloud setting. How can I change it?
Example my Apple ID is [email protected] I just enter xxxx and now it always state [email protected] but I can change the ID or enter the right password. Please help.

Hello nikhilb05,
Thank you for using Apple Support Communities. 
I have provided a couple of articles for you to provide information on administering your Apple ID and changing your password:
Apple ID: Changing your password
If you forgot your Apple ID password
Regards,
Jeff D. 

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