for Mobile (320pix x 480pix)
Windows
When you click on the size you want for your screen, a new window will open. Right click in the new window and choose "Set Background."
Macintosh
When you click on the link with the size you want, a new window file will show up on your screen. From there, you need to click on the setup you want (this will take a few seconds) from a new menu in which you need to choose the option to "Download to disk." Once you have chosen the destination for your download, click on CONTROL+ on the desktop, and "Setup for desktop" will appear on your screen. On that desktop menu you will be asked to choose which picture you want to use. Go to the file where you stored your download.