Help with Fancy Box

Hello, I am new to WordPress and could use some help. I am a designer so my knowledge of web development is limited though I do know some things.

I’ve been asked to update my company’s website, as we are moving and wanted to update a few other things. WordPress makes most of it easy but I’m having difficulty with certain elements. Most content pages have 3 images at the bottom that open up fancy boxes (I assume based on inspecting them) with info, however I can’t find where to edit this info. The images don’t even appear on the pages editor. Below is a link to a page that has the images. If someone could please help me out I’d very much appreciate it.

https://www.comgraphics.com/digital-printing/

Thanks!