My name is David.
By performing the following procedure you can reset the password:
Reboot your computer.
Press the Command and R keys at the same time immediately when the computer initially starts and hold them until you see the Apple logo.
Wait until the computer boots into Recovery Mode.
Click the Utilities tab in the top menu bar.
Type resetpassword ***** the terminal window and press Enter.
Close the Terminal window.
In the Reset Password ***** that is now visible, select a user account and type in a new password.
Click Save and then click the Apple menu and select the restart option.
When the computer boots, login with the new password.
Please let me know if you need assistance with any of the steps.