To use these as wallpaper:

1 - Click on the image to get an enlarged view.
2 - When the image has finished downloading, right click on the enlarged image.
3 - From the pop-up menu, choose "Set as wallpaper"
4 - If you want to copy any others, repeat steps 1-3"

You only need do these if you downloaded more than one wallpaper:

5 - Minimize Navigator or Explorer and right click on the desktop
6 - From the pop-up menu, choose "Properties"
7 - Scroll down to highlight the desired wallpaper, click "Centered" and click "Done"