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Change a password or user picture on Mac
If you’re a standard user or an administrator, you can change your password or user picture.

On your Mac, choose Apple menu
> System Settings, then click Users & Groupsin the sidebar. (You may need to scroll down.)
Click the Info button
next to a user in the list on the right, then do any of the following:
Click Change Password to change your login password or click Reset Password to change another user’s password.
Click a user picture to change the user’s login picture.
Tip: You can also click a user picture in the user list to change the picture.