For Windows
Save the image you want to use as your wallpaper. Make sure it’s in a location where you can easily find it, like your Desktop or Pictures folder.
Go to the folder where your image is saved. Right-click on the image file.
From the menu that appears, click on "Set as desktop background." Your image will automatically appear as the wallpaper on your desktop.
For Mac
Save the image you want to use as wallpaper to your Mac, in a folder like Desktop or Downloads.
Click on the Apple menu in the top left corner and select System Preferences.
In System Preferences, click on Desktop & Screen Saver.
In the Desktop tab, click the + button or the dropdown menu under “Desktop Pictures” to find your image.
Navigate to the folder where your image is saved and select it.
