Cannot get pop up slideshow to work

Hi Guys! Love the plugin. I can finally upload images ??

I need help with something tho. I can’t seem to figure out how to get the thumnails when clicked to open a lightbox and start a slideshow. When you click on thunmain, it sends you to a sublink where the image is.

Any help will be greatly appreciated ??

here is the site https://new.communitycenter.org.tw/auction-2013/

https://www.ads-software.com/plugins/nextcellent-gallery-nextgen-legacy/