Do you have your images uploaded at all? If so, try entering the path to the image in the browser to see if you can see it. I'm thinking that you just don't have the right web address to your images if you're doing what I said earlier, as that is pretty much all there is to adding an image. I believe there's an image tool for it, but I haven't looked at the program in a while so I'm not 100% positive on that. Either way though you'd still need the actual url to the image to make a link. If you can get to that far then it would be much easier to tell you the code you need to enter for the images.
also if you have a link to the store and the page in particular you're trying to add the images on (especially if you already have the setup there that isn't working) we can help much better by seeing what is actually there on the page for the code
