Follow these simple steps:

1. Install and setup Silverstripe.
2. Download Page Elements and extract it to the root of your Silverstripe
3. Execute http://<<your-url>>/dev/build/?flush=all
4. Create GridPage Templates in your theme's 'layout' folder.
5. Login to the Admin interface, select "GridPage" as PageType in the Behavior-Tab and Choose a Template.
   
6. Save and Enjoy!