Dynamic Lightbox Using CMS

I am not entirely sure I am calling what I want the right thing, which is why I probably struggled finding a solution on Google. Regardless, I am attempting to create a Lightbox-esque pop-up when selecting a team members image. This pop-up would include the same picture, title, email, cellphone, bio, etc. What I don’t want is to click the picture and it takes you to a completely separate page.

I am new here. I am new to HTML/CSS. I am new. Please ELI5.

Below is a link to the site I have:

Below is a link to the site with an example of what I am looking for:

I forgot if there is something else I need for this. My apologies if so.


The new guy!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)