How to change system greeting?

Version 1
    This document was generated from CDN thread

    Created by: Pipat Tipvapee on 23-04-2012 05:34:31 AM
    I used Cisco Unity Connection 8.6.1 and want to change voice follow any greeting(eg. standard,busy,holiday greeting) How to change it?
    [Explain step by step]
    Step1. Mike call to Jack
    Step2. Jack isn't unavailable, Mike hear standard greeting.
    Step3. Unity System tell Mike "Record voice msg when you are finish.. press # "
    Step4. Mike record his msg to voicemail.... and press # to finish and press # again to send a msg.
    Can I change voice in Step3? and How to record new voice?