You can either:
1. Right click on the picture and choose 'Set as Wallpaper' from the dropdown
menu
OR
1. Right click on the picture and choose 'Save as'2. Make sure you save the pic as a BMP (bitmap)3. Remember where you saved it!!!!4. Right click on your desktop screen and choose 'Properties'5. Click on the tab that says 'Wallpaper' and then click on 'Browse'6. Find your wallpaper from wherever you saved it7. Click on 'Apply'8. Voila! You have a brand spanking new wallpaper! Enjoy!