No access to site 404 error only

Hey all, i just created the site http://forum.sjkvb4.bplaced.net/ to host a forum. I´m now having troubbles accessing this site, i only get 404. Do i need to activate something?

I get an empty page when I click on your link.
Have you already uploaded your forum software?
New subdomains also take some hours until they work.

Hello!
It looks that your forum is available at http://sjkvb4.bplaced.net/ if you want to have it at http://forum.sjkvb4.bplaced.net/ you have to set the home directory of it at http://www.bplaced.net/?handler=dns to the same home directory of sjkvb4.bplaced.net