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Question: unable to unlock system preference’s lock

Can someone help me how to unlock the system preference’s lock. I just change the admins name and my macbook air restart when it opens the account was no longer in the users and groups, i tried to add a new admin account and i click the lock and i try to type the new username and the same password but the lock won’t open anymore. can some one help me?

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Question: unable to unlock system preference’s lock