How to Change Lock Screen on Mac Mojave?

How to Customize the Lock Screen on MacOS Mojave

Step 1: Rightclick on the desktop and select Change Desktop Background from the context menu. Step 2: Navigate to the wallpaper or pick in anyone from the available album folders as your wallpaper. Step 3: Click on the  Apple Menu and select Lock Screen to confirm that the new wallpaper is visible on the lock screen.

Easily Change Your Login Screen Background on a Mac

Navigate to /Library/ Desktop Pictures folder on your Mac.
Find the file named “Mojave.
Rename “Mojave.
Copy and paste the image that you want to use as the background to the /Library/Desktop Pictures folder.