Right Click and Save Image to desktop, then right click the desktop image and set it to your desktop background.
Apple Watch Wallpaper
Use your phone and hold the image and put it into Photos, go to Photos and click the upload icon, see copy photo, scroll up until you see Create Watch Face, select your preference, then click ADD.
Add Your Heading Text Here
Use your phone and hold the image and put it into Photos, go to Photos and click the upload icon, see copy photo, scroll up until you see Use as Wallpaper, select your preferences, then click DONE.