Help learning image popup

Store Design
1

I was modifying a theme on my website, usdentalinc.com, to add the ability to make a popup be an image instead of a newsletter signup.

I found an answer here:

https://community.shopify.com/c/technical-q-a/how-can-i-add-a-custom-pop-up-image-to-my-website/m-p/1526229/highlight/true#M82994

I simply pasted in the code which works great, however the options to not make the popup show up on every page does not work.

EDIT: I am running ware-house theme V2.8.4

I am also looking for a way to have the pop up takes users to a collection when clicked on.