redhat 6.2

[mac ten]

I don't know what program im suppose to use to change
my screen display in redhat 6.2.  I was thinking XF86
but it does not work or im trying to start it wrong.
I read some different to start it but they did not
work.  Please help. 
Thank You.
PS. this is my first email using my cable modem and
linux through my router, thanks for the help jeff and
josh.  :)

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