1. In the “App Integration” page, click the “Enable” button for the applications you would like to integrate with. 
2. Upon clicking, you will be redirected to a page on the third party app where you will be prompted to enter your account information to authorize access (this is specific to Greenhouse and Google Calendar). 
3. To enable integration for iCIMS or Lever, please contact support_team@rakuna.co to get help on getting the necessary API key.