How to embed my form as lightbox to Squarespace website

I don't see how to do the lightbox either. I see how to embed the form to Squarespace page, but there's no reference in that thread or post on how to have it so you click a button, and the form pops up in a lightbox. Maybe i'm missing something too? 

To get your lightbox codes, this guide should help: https://www.jotform.com/help/220-How-to-Create-a-Lightbox-Form.

To embed the form to your Squarespace website in a lightbox format, the following guide from Squarespace should help add the script:

https://support.squarespace.com/hc/en-us/articles/205815928

If you cannot get it to work, you may consider contacting Squarespace support for help: https://support.squarespace.com/hc/en-us/requests/new.