The Web Administration Portal is designed for two types of users. One is the System Administrator(s) which may be a technical person or even an office or business administrator. The Local Phonebooth Administrator(s) is the person(s) who setup and manage the day-to-day capabilities of the phone system. After you login to the portal (see How to Login article), the Local Administrator will see a row of icons across the top of the screen (Users, Groups, Conferences, Calls, Numbers & Devices, Auto-Attendants & Voicemail).
Clicking on any of the top bar options will allow the Local Administrator to configure that section of the Phonebooth service.