PC download: Right-click on the image and select 'save picture as', save the image to a location on your pc for later transfer to your phone.
MAC download: CNTRL + Click the image you would like to download, and select 'save link as', save the image to a location on your mac for later transfer to your phone.
Wallpaper download instructions:
PC download: Click the image you would like to download, this opens the image in a new window. Right-click on this image and select 'set as background'.
MAC download: CNTRL + Click the image you would like and save it to your hard drive. OS9: under the apple menu, open control panel/appearances. Click on the desktop tab tab, then click 'set desktop'. OSX: open your system preferences and click on the dektop icon. Drag the image you want as your desktop into the 'current desktop image' thumbnail.