If you would like to use the content you saw in the demo site, you have the option of importing it.
Firstly download the Show+Tell Demo XML file.
Then to import start by navigating to Home > Tools > Import > WordPress and install the plug in you will see there. Select the file xml file which you downloaded.
You have the option to import the entire demo site, or individual pages. If you would prefer to use just one page, you can select the txt file of your chosen page from extras/layouts, copy the code and paste into the text editor in the page or post. This will give you a good starting point to build your website upon.