To be able to use any Calendars, you'll have to add users within the calendar first. This will also allow you to edit them and customize them to your liking.
Go to Settings
Click on the "Settings" button.
Go to Calendars
Once on the Settings menu, go to "Calendars".
Select a Team
Choose the team calendar. Click the "Edit" button next to the team's name.
Add User(s) To Calendar
If there are no users on the calendar, click on "+Add User".
Select the User(s) for the Team
Select the team member(s) you'd like assign the calendar to. The minimum is 1 person per team.
Save it!
Click on "Save" to save the changes.
Now your Team Calendar is enabled and you can start editing and customizing your calendar(s).
Enable Calendar
Once the Team members are added, click on the "..." on the selected calendar, then click on "Enable Service".
