iFramed content not loading

Hi! I love this plugin, I’ve been searching for something to feature photos & text in a lightbox for ages. However, the lightbox doesn’t seem to be working for me!

What I’m trying to do is have an image on a page and then clicking on the image prompts the iFrame with the text & images. Is there a certain setting I need to check off? I’m using the iFrame code on the “Description” tab, to no avail!

Thanks so much!
Chris

https://www.ads-software.com/extend/plugins/auto-thickbox-plus/