If you use a Mac for personal purposes only, you may want to change your password because you suspect that someone might have stolen it. If you use a Mac at work, you may be required to change your password for security reasons from time to time. How to Change Password on Macīefore we teach you how you can reset Mac password when you don’t remember the original password, let’s go over how you can change a known password. Note: To stop losing passwords we recommend to use password management software like Dashlane or google other apps yourself.