How to Change the Login Screen Wallpaper in OS X El Capitan

1. How do I change the picture on my Mac login screen?
2. How do I change my Apple ID picture on my Mac?
3. How do you change users on Mac lock screen?

How do I change the picture on my Mac login screen?

Change a user's login picture on Mac

1. On your Mac, choose Apple menu > System Preferences, then click Users & Groups. Open Users & Groups preferences for me. ...
2. Select the user account on the left. ...
3. Do one of the following to the picture on the right: ...
4. Adjust the picture. ...
5. When you're ready, click Save.

How do I change my Apple ID picture on my Mac?

Select your Apple ID picture on Mac

1. On your Mac, choose Apple menu > System Preferences, click Apple ID. If you haven't signed in to your Apple ID, click Sign In and type your Apple ID information. ...
2. Click the picture above your name in the sidebar, or drag an image file from the Finder onto the picture, then do any of the following: ...
3. Click Save.

How do you change users on Mac lock screen?

On your Mac, choose Apple menu > System Preferences, click Users & Groups, then click Login Options. If the lock at the bottom left is locked , click it to unlock the preference pane. Select “Show fast user switching menu as,” then choose how the fast user switching menu looks in the menu bar.