How do I sing out of iCloud?

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icloud Apple id issues

I recently updated my iPhone to the latest software and now it continually asks me to sign into my Apple ID and my iCloud. I have tried everyone's suggestionon and nothing works. It won't allow ,e to sign out of iCloud it won't verify and says I have to go to my daughters old email that is no longer in existence to verify the account. Also when I try and update an app it asks me to log into my daughter Apple id even though my Apple ID is correctly logged in all thought my phone. I want am even trying to restore my cell and it won't let me turn off "find my iPhone" like iTunes asks. Please help me!!!!!