For PC

• Choose your screen resolutions to open the full size version of the image. It will open in a new window.
• Right mouse click on full size image
• If available, choose "Set as Wallpaper" or "Set as Background"
• If not, choose "Save Image As", then choose a file name and add ".jpg" (Save the image to your desktop so it is easy to find)
• From the Start menu, go to Settings, Control Panel, then Display, then Background - choose "Browse", go to "Desktop", then open the "jpg" file and Click "OK"
• From the Display options you can also choose whether to center the image or stretch it to fill your desktop.
  

For Mac

• Choose your screen resolutions to open the full size version of the image. It will open in a new window.
• Holding Ctrl and clicking the full size image simultaneously, choose "Download Image to Disk"
• Save the image to your hard drive, preferably in Library | Desktop Pictures From the "Finder" menu choose "Preferences"
• In the "Preferences" window, click "Select Picture" and navigate, using the file window that opens for you, to your wallpaper image
• Click "Choose" to confirm your choice.