Right now http://gamerift.cz/ loads just fine, but it’s not a Discourse site. You have a DNS issue, and perhaps a networking issue.
A bit off topic but you should really update Apache and maybe your VPS as well.
Ok so i have to add dns to domain ?
If you want http://gamerift.cz/ to be your Discourse site, you’d need to change its A record to be the IP of your Discourse site.
Also i have to set VPS ip as dns?