Hostname changes / nameserver problems?

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http://forums.cpanel.net – So I noticed when you change your hostname, the hostname does not change in the dns entries.. Is there a way to change the hostname globally / all together? I've tried changing it via WHM + updating the records, still does nothing to anything else.. Can't access domains, i've already updated name servers, however for some reason it does not show up in whm (show/edit reserved ips, show or delete ip addresses, or show ip address usage).. Not sure what I'm doing wrong.. The nameservers are correct in the dns entries, and does show under dns functions > nameserver ips CLOUDLINUX 6.3 ()