As per the readme file that came with the lightbox, these are the instructions:
Enabling Lightbox on the Product Details Page
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In order to enable lightbox on the product details page, copy the files in the attached zip to the following folders off the root of of your dnn install:
\css
\js
You should alread have a \js folder so just copy the .js files to your existing \js folder
You most likely will not have a css folder so copy the css folder as is with the lightbox.css file in it.
Note: Its not required that you copy the lightbox files you only need to copy them if you want to enable lightbox on the product details page.
1. What's the next step after that?
2. How do you actually make the calls to the lightbox, or which setting to change?
3. Where do I place the code that you are referring to above?
leonard