To download: Click on the text link below the image for the size you would like. The image will load. Right click and choose "Save Image As". Choose a place on your computer to save it, such as the Desktop. Once the image has downloaded, minimize your web browser and navigate to where you downloaded the image. Right click on it and choose "Set as Desktop background"
To view: Click on an image and use the right or left arrows to browse through the images.