Getting started with Fantastical is simple. First, you need to add your calendar accounts in Preferences.
Start by clicking on the Fantastical icon in your menu bar to reveal the Mini Window, then click the gear icon in the lower right to open the actions menu. Choose Preferences from the menu. You can also access the preferences by selecting Preferences from the Fantastical menu.
To add a new account, go to the Accounts pane in Preferences.
Apple requires that iCloud accounts have two-factor authentication enabled in order for apps to connect to iCloud's calendar or mail servers. If you don't have two-factor authentication enabled, enable two-factor authentication on your iCloud account before continuing.
To add a Google account:
To add an Exchange account: