Place your cursor over the image, hold down the right mouse button, and select "Set as Wallpaper" or "Set as Background." Dora should now be your computer's wallpaper.
Instructions for Macintosh
Select the resolution that matches your computer's settings.
Move your cursor over the image. Drag the image to your desktop. Open "System Preferences" and select "Desktop." Drag the image into the desktop pictures window. Select the image as your desktop. Dora should now be set as your wallpaper.