Here are the instructions to break the link between a Google account and ActiveDEMAND:

  1. Remove the app connection in ActiveDEMAND (Administration->Account settings->3rd party apps) 
  2. Save your ActiveDEMAND account 
  3. Log into your google account here https://myaccount.google.com/ 
  4. under 'Sign-in & Security", click on "Connected apps & sites" 
  5. under "Apps connected to your account", click on "Manage Apps" 
  6. click on "ActiveDEMAND" 
  7. Click on 'Remove"