TwinMind syncs with your Apple Calendar to show your upcoming meetings and events. To add more calendars, you'll need to add them in Calendar settings first.
On your iPhone or iPad, open your device settings.

Then tap Accounts → Add Account

Select the calendar service you want to add (Google, Outlook, Yahoo, etc.).

<aside> 💡
Note: If you use 2-Step Verification on your Google account and don't have the latest iOS, you may need to use an app password instead of your regular password.
</aside>