To have the user name under your preferred name, create a new user account instead and let Mac OS take care of the setup for you. Modifying your user account is for advanced users only, do not attempt to do so unless you are experienced with Apple Mac. Once you’re back up and running you can go to Apple > System Preferences > Users & Groups and select the Allow user to administer this computer checkbox for the ‘grant’ user. NOTE: You should choose a new user name for this admin account.

Don’t worry, your other user accounts should be intact. Your Mac should reboot and you can log in normally, after which point the Setup Assistant will launch. Keep the keys down until you see text on the screen If your Mac restarts, follow the steps for option 1, above. Option 2: Reset using your Apple ID If you see the option to reset using your Apple ID, click it. When the password reset is completed, click Restart. Enter your new password information, then click Next. Power up your Mac and immediately press and hold the command + S keys Select a user that you want to reset the password for, then click Next. Before attempting the fix, make sure to back up your data first. The below is a fix for the above problem and is only recommended for advanced users only. If you tried to modify your user account name under Users & Group in Mac OS High Sierra 10.13 may cause loss of administrative privileges with your user account and you will not be able to authenticate your computer as administrator anymore: Note: modifying your user account in Users and Group in Apple System Preferences are for advanced users only.

Reset admin password mac os high sierra