human
How do I change the background on Windows 10?
assistant
Customize Windows 10
1. Click the Start Menu icon and click the Settings icon.
2. Click Personalization.
3. Click Background.
4. Click the drop-down menu under "Background."  
5. Select Picture.
6. Click Browse under "Choose your picture."  
7. Double-click to select the picture.
8. Choose a fit.