Thanks. Like I said, I’m new to this. Consequently, I am not savvy enough to know when something is related to a theme (commercial or otherwise), WordPress in general, or one of the plugins that, as I said, were downloaded from www.ads-software.com.
I do want to point out that I did read the Welcome Post regarding rules and commercial products. Under “The Bad Stuff” it says, “Ask for help regarding premium themes/plugins. We do NOT support premium themes as you paid for their support when you bought it and it is not our place to keep shady vendors in business. If someone wants to help, that is fine.”
Though this statement is under the subheading, “AKA what not to do” it does also imply that it is ok to ask since it’s apparently fine for someone to help if they want to. Obviously they wouldn’t be able to decide whether they want to unless I asked the question.
All that said, I activated a non-commercial theme and, low and behold, lightbox-url still wasn’t in the list. Huh. Turns out all you have to do is type it in and add it. Well that sure was an easy answer to a non-problem that had nothing to do with the theme source and everything to do with my inexperience.