You can connect the Google Calendar from:
AI Scheduler → Calendar page or from
Integrations page
But bear in mind that Google Calendar integration works on a user level, meaning every user would need to connect their own calendar with iClosed account.
Go to
AI Scheduler → Calendar or m Settings → IntegrationsClick on 'Connect Google Calendar' button
You will be redirected to choose the account you want to connect
Select the account and grant all the necessary permissions
Learn more