Aporte original por: ForumHermit ,
First of all, is your MacBook account linked to your Apple ID? Because if it is you can use that to change it. But if not, boot into Recovery mode. When the MacBook is booting up hold down the “COMMAND” + “R” at the same time. Select Utilities from the Menu Bar. Select Terminal. Type in “resetpassword” and then press enter. Change you password. For more details you can go [https://coolestguidesontheplanet.com/reset-forgotten-admin-password-mac-osx/|here].