How do I set my wallpaper for my PC or MAC?

On a PC.
Choose the size of wallpaper that fits your monitor's screen resolution.
There are five options: 800 x 600, 1024 x 768, 1280 x 800, 1280 x 1024, 1440 x 900 and 1920 x 1200. Click on the option you want and a bigger image will appear in a new browser window.
Move your cursor over the big image in the new window and right-click your mouse.
A drop down menu will appear from which you need to select Set as Wallpaper or Set as Background. Your new wallpaper will appear on your desktop.

On a MAC.
Choose the size of wallpaper that fits your monitor's screen resolution.
There are five options: 800 x 600, 1024 x 768, 1280 x 800, 1280 x 1024, 1440 x 900 and 1920 x 1200. Click on the option you want and a bigger image will appear in a new browser window.
Control click on the image in the new browser window and select Save this Image as to save the image to your Mac.

Go to the Apple menu and select Control Panel then select Appearance.
Choose the Place picture option and locate the image you just saved and then click Set Desktop.