Print the cover using your system's highest resolution. Move your mouse. That's your pointer. When your pointer turns into a pointing finger, it indicates that you can click. If you want to know if something can be clicked, try it.
Every computer is different.
To save an image, you first have to let it fully load. If you can see the entire image on your screen, then it's ready. Your system might have a gauge at the bottom of the screen that will show you how fast the image is loading. Once the image is fully on your screen, place your pointer anywhere on the image and 'right click' your mouse. Right handed folks use the middle finger.