If you upload screenshots then it will replace the cover image that automatically shows there. Are you trying to not have any images or sidebar?
Yeah, and have everything centered instead. I found out about the screenshot part by mistake, though, so it's fine as it is now. Thanks for the reply.
If you end up needing to hide the column, I can enable the CSS editor for you. Just say so!
I would like it enabled afterall. Mostly because I'd like to put a download link for the Demo near the top of the page.