The lightbox opens a popover window above the page when the link is pressed. It is great for displaying larger images or media that would be cumbersome inline on the page. Place the lightbox tags on the page, and insert the content that you wish to display in the lightbox between them.
Lightbox 2 Settings
Lightbox 2 only takes one settings, and that is the name of the trigger text that will pop open the lightbox. After that simply enter your content between the tags.
See here for a brief introduction to using Poodll Widgets.