How do I add a Youtube video to a lightbox in Fixer theme?

No matter what I've tried I haven't been able to get the Youtube element to work again. I had a video image and was trying to create a lightbox for a video. I deleted that because I thought maybe I shouldn't have the image since all it would allow me to do was send people to youtube instead of adding the video to my site. I tried adding the youtube element again without an image and it still does nothing at all as if it's broken. No way to add a url, lightbox or anything. I then tried downloading the WP Video Lightbox plugin thinking that maybe I needed it. That also didn't work. In the past the youtube element worked for me though. I gave support access and the site I'm having the problem with is /demo-starter-site