Note: This feature can only be used by Team Leaders / Admin accounts.
From the Admin account, click on the My Account menu and select Admin Config or Master Config:
Next, set the Calendar Entries to 'ADD' with the dropdown on the right:
Now that the sharing is turned on, you'll be able to select which events/entries are to be shared. Navigate to the Appointments tab, click on an existing event, then select 'Edit this Event'.
From here, you'll see the option at the bottom to share the event with your team:
This feature applies to both Existing events and New events that you create going forward.