How to login to Cisco Unity Connection Assistant Web Tool(Cisco PCA)?

Version 1
    This document was generated from CDN thread

    Created by: Pipat Tipvapee on 23-04-2012 12:09:21 AM

    When I try to login Cisco Personal Communication Assistant with Administration account, It show msg
    "This user account does not have a mailbox and cannot sign in to the Cisco 
    Personal Communications Assistant. To use the Cisco PCA, you must have an 
    account with a mailbox."

    How to create username and password to login URL https://<unity_address>/ciscopca