Reset Apple Admin

Boot Mac into recovery mode

- shutdown the laptop

- press and hold the Command and R keys on your keyboard, then press the power button. Hold Command+R until you see a progress bar show up below the Apple logo.

Open the Terminal

- Click on Utilities then Terminal

Enter "resetpassword" on the terminal

Close the terminal and use the reset password tool

Follow the prompts, select the user account you need and change the password