"Read all the topics in the Introduction Section..."

Hello, I'm getting set up here an I found some intsructions that I can not follow: http://screencast.com/t/De5rhVshpPF

That screenshot is from the http://www.codeigniter.com/user_guide/ov...arted.html page.

There is no "Introduction" section.

I've read what I can, and I'm moving on to the General Topics.