For PC Users:
Click on the link that is the same size as your screen. Click on the picture with your right mouse button and a menu will appear. Select the “Set as Desktop Background” option.
For Mac Users:
Click on the link that is the same size as your screen. Hold “control” + click on the image, and select “Set As Desktop Background”. If this option is not available, hold “control” + click on the image, and select “Save” from the popup menu and save the image to your hard drive. Access your system preferences (under the apple), choose desktop/screensaver, and look for where you saved the wallpaper, select it and you’re good to go!