How do I change the default desktop background on my laptop?

Discover your current wallpaper:
Press the Windows Key + R on your keyboard. type Control and press OK. Select Personalize from the list of options. Check the desktop background image.

Select a pre-existing wallpaper:
press the Windows Key + S and type Wallpaper. Select Background Settings from the list of options. Select one of the available backgrounds, or upload a personal picture.

Alter the background fittings:
To adjust the size that the image is displayed on the surface of your laptop, select an option from the dropdown menu labelled Slide show.