The error message indicates that this user is set to be protected against edits in the config.php file. If you have access to the account, then you can also change the password in the front end (ie. UserCP -> Edit Password). If you need to change it from the AdminCP, then you will first need to remove the users userid from the $config['SpecialUsers']['undeletableusers'] variable, edit the password and if wanted add the userid back in the config.php file.
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