Change your login screen photo
When you log in or switch users, you will see a list of users with their login photos. You can change your photo to a stock image or an image of your own. You can even take a new login photo with your webcam.
You needto edit user accounts other than your own.
Type "Settings" into the global search bar on your desktop. Click on the resulting Settings icon, or press Enter, to open.
Click on Users.
If you want to edit a user other than yourself, press Unlock in the top right corner and type in your password when prompted.
Click the picture next to your name. A drop-down gallery will be shown with some stock login photos. If you like one of them, click it to use it for yourself.
If you'd rather use a picture you already have on your computer, click Browse for more pictures….
If you have a webcam, you can take a new login photo right now by clicking Take a photo…. Take your picture, then move and resize the square outline to crop out the parts you don't want. If you don't like the picture you took, click Discard photo to try again, or Cancel to give up.