[TYPO3] Simple Typoscript question

[Mike]

I'm trying to put Smoothgallery on my page, folling the documentation:

http://typo3.org/documentation/document-library/extension-manuals/rgsmoothgallery/1.5.0/view/1/1/

I've installed the extension, and made a page with a "Text with image" 
record in it's center column with some images, and the "Activate 
smoothgallery" checked.

When I view the page, I get the default "hello world".  Is there 
something I need to put into the typoscript to make the gallery actually 
show up?

This is probably so obvious that it's not even mentioned in the 
documentation.  How do I just make the slideshow show up?