Make sure the Voice Control button is displayed at the bottom right corner of the screen. (For help, see the FAQ How do I display the onscreen shortcut for Voice Control? 
Tap  and wait for the tone. Say one of these command phrases:
  • Arm Stay
  • Arm Away
  • Disarm
  • Home (Returns display to the Home screen)
  • Sensors (Displays a list of your system’s sensors)
  • Keypad (Displays the on-screen or "virtual" keypad)
  • Events (Displays the Events list)
  • Settings (Opens the Settings menu)
  • Profile (Opens the Profile menu)
  • Location Settings (Opens the Locations menu)
  • Manage Locations (Opens the Manage Locations tab on the Locations menu)
  • Change Password (Opens the Profile menu for quick access to the Change Password tab)
  • Help (Opens the Help menu for access to these FAQs and other resources)
  • Sign Out (Exits the app; next time the app is used, your device will require sign-in)
NOTE: Depending on your settings, you may be required to enter a user code for certain operations. See the FAQ What does "Prompt for User Code mean? under Profile Settings.