This article explains how to change the login picture on your Mac, how to change your Mac login background, and provides some related tips.
How to Change the Profile Picture on Your Mac Computer | How to Change a User Account Picture on a macOS
Changing your Mac’s login picture takes a few clicks in your System Preferences, but the process comes with a catch. Here’s what you need to do:
Click the Apple menu in the upper-left corner and click System Preferences.
Click on Users & Groups.
