Integration/customization Thesis 1.8 theme

Can anyone assist or shed more light

I'm using the Thesis 1.8 theme and want to do a simple integration so that the pages use the no sidebar template that exists within Thesis - this should be simple, yet I'm not finding a way to make this happen with the very simple documentation on how to customize the plugin pages. I'm looking for a bit more info as the simple documentation is a little cryptic - at least for me.