Lightbox pop-up not working

please also check that the plugin / system / Mediabox CK , is published

I apologize but the plugin is published and enabled.

please give me an admin acces
www.joomlack.fr/en/contact

the problem is that there is no lightbox loaded in the page, even if you have set the option in Slideshow CK, you must have a lightbox running
I don't see the mediabox plugin in the source code of your page, so I need to check what is wrong here

I entered the Item ID of the page where to load it, or tried to. Do you need to log in to the backend?

please leave empty the ID of the page to load it everywhere, first we need it to work. Then you can improve the loading by page

yes I need an admin access if you don't manage to make it work

OK, I will set up access for you. What do you want your credentials to be?