Hi There,
You need to add a a class to a button and than use this class to launch the lightbox.
So for example add the class: my-modal to the button – The button should link to the content you want to have on your lightbox.
than add on your page in a raw content element on Cornerstone or in a div in case you are not using Cornerstone the lightbox selector. [lightbox selector=”.my-modal”]
Note that the lightbox is not designed to hold html content inside, it might work but it also might present a few bugs.
An alternative method would be to use Convertplug: https://www.youtube.com/watch?v=53evC1A-4UE
Hope that helps
Joao