Click on a thumbnail to access the larger image. For PCs, right-click on the larger image, select "Save as," and save the image to your desktop. For Macs, click and hold on the larger image, select "Save image as," and save the image to your desktop.

You can find out which resolution to choose by right-clicking on the desktop, choosing "Properties," then "Settings" and reading the "Desktop Area" [PC]; or by clicking the Apple Menu, choosing "Control Panels" and then "Monitors," and reading the "Resolution" [Mac].