To set one of our wallpapers as your PC desktop wallpaper firstly select the image resoloution (size) that you require, then simply right click on the image that will open in a new window (if you have a pop-up blocker you need to turn it off), then choose 'Set As Background' from the menu. For help on finding the size of your PC/Mac desktop, or setting images as your desktop wallpaper please see our help section here.