To change the desktop screen on a computer, you can follow these steps:
Right-click on the desktop and select "Personalize" from the drop-down menu.
In the Personalization window, click on "Background" in the left pane.
Here, you can choose a new picture from the list provided or browse for an image on your computer by clicking on "Browse."
You can also select the Picture Position (such as Fill, Fit, Stretch, Tile, or Center) to adjust how the image appears on the desktop.
Once you have selected your desired image and settings, click "Save changes" to apply the new desktop screen.
This process may vary slightly depending on the operating system you are using, but these general steps should help you change the desktop screen easily.