Hello there,
First, CCR Tree doesn't have number of rings. Only AA does.
Second: CCR is a Tree which have a different branches to rich different Departments or Groups in the system by pressing one digit or have another Menu with another instruction.
Third: You can change Company Greeting from any 16 or 10 button phone in the system.
Fourth: In order to get rid of "denied in admin" you must know how to allow that feature for that extension in system Admin.
In previous post you said it is not (that hard)but obviously it is for you. You can't do set up Norstar without any knowledge and experience.I don't want discourage you but you better find local tech to help you out. It is not that easy let me tell you. Sometimes guys who've been in this field for 20-30 years can't figure things out and asking for help.