Note that I have checked the box below that says: "Check this if you'll be adding code (or don't like smileys)"

Here is HTML link with Lightbox code inserted. Lets' see what happens:

<a href="http://radified.com/gfx/backbay_newport.jpg" rel="lightbox" title="Sunset at the Newport Back Bay: Newport Beach, California">HERE</a>

Doesn't work. The forum operates on different principles than a normal web page.

Reference: Lightbox site > http://www.huddletogether.com/projects/lightbox2/