If it's the same as the normal "desktop" RH's, if you're Gnome or Kde you can change it from the menu item "network" or in a shell as root type "neat" or at the shell type "hostname <mynewhostname>" (although this method doesn't seem to stick for me) or edit the file "/etc/sysconfig/network" and change it in their.
Don't remove any references to localhost know in the "/etc/hosts" though unless ya want grief.
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