Please follow the below instructions to change your computer password.
NOTE: You must already be logged in to your computer and you must know your current password to be able to change it.
Open System Preferences
Click on ‘Users & Groups’
Click the lock in the bottom left corner
Enter your username and password
Select your name on the left, and click ‘Change Password’
Enter your current password, new password, and new password again. A hint is not required or recommended by us.
Click ‘Change Password’