Thanks for a quick reply.
I tried doing this:
CMS -> Pages -> Home Page -> Design -> Layout ->
"Change from 2 column with right bar" into "1 column"
System -> Cache management -> Select all -> Actions, refresh -> Submit
It didn't work. Only thing which happened was that the "quick links", "special offer", "buy canon rebel", "community poll" and "now accepting..." vanished. But the HelloSlide is still not showing. Just check the site (right now it's set to "1 column").
I just want the theme to look like the one in the demo.