|Samsung Galaxy instructions (Android): Download the image to your phone by clicking one of the download links below. Press and hold your finger on a clear area of the home screen for a moment. Tap Set wallpaper on the pop-up window that appears. Tap Home screen, Lock screen, or Home and lock screen as desired. Tap your wallpaper source. Gallery will let you look through your entire library of images. Set the appropriate cropping by tapping and dragging the boxes.The outlines show how much of the image will be visible when the phone is held upright or sideways. Tap Done in the top-right when you’re happy with the crop scheme.