Depending on whether you are using an Apple (iOS) product, or Android product, the navigation will be found at the bottom or top of the screen.
iOS navigation is on the BOTTOM Android navigation is at the TOP
Navigation is broken out into 3 parts:
* VirtualOffice - where you can access your Inbox for Voicemails and Faxes, View Inbound Call Logs, View Outbound Call Logs
* Keypad - where you go to place an outbound call, using your phone's keypad
* Contacts - where you go to review your device's contact list, to place a call