How to create a Lightbox with text and image (team bios page)

Hi there,

I am hoping to create a Lightbox in an our team page. I would like the Lightbox to open up with the picture as well as their name, job title and bio text. I've used the people section as a template and one of the options is to add a 'read bio' button. I'm just unclear where the bio goes and how it could be transformed into a Lightbox overlay. 

This website has the effect I'm trying to achieve:
https://browningenvironmental.com/people-3/

Any thoughts would be much appreciated! I'm not very savvy with code.