I can't get my homepage to look like the demo

To set up your homepage like the demo, create a new page to use as your homepage, then go to Settings->Reading and select it as your static front page. Then go and edit that page, and set its template to 'Homepage', and use the module shortcode generator to build your layout. For your reference, the layout modules used in the demo are these: [loop category=world-news module=a ][loop category=games module=a ][loop category=all module=gallery][loop category=sports module=b ]