On the general settings page, I have the selector word “lightbox”. You will use this in the html code when you want a lightbox to appear.
In the settings further down on that page, I have disabled all the options that would add a lightbox by default. Instead I use something like the following code to enable the lightbox:
<a rel="lightbox" href="http://vimeo.com/86019637" title="">Your words or an image here.</a>
It’s the rel="lightbox"
part that activates the lightbox, since “ligtbox” is the word I choose for the rel selector in the general settings.
Hope this helps!