The following knowledge base article will assist you in changing the password you use to login to your Apple Computer.
1. Click on the logo of the 
in the upper left-hand corner.
2. Click on System Preferences.
3. From System Preferences, click on Users & Groups.
4. Click Change Password.
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5. To change your password, please enter your Old password, New password, and Verify. Your Old password is the password you used to login to your account.
6. Click Change Password to finalze your new password.