Click on the `+` (plus) symbol to add a calendar to access, click in the _Users_ box and start typing the calendar name. It will now search for a list of calendar that match the keyword. From the the drop-down menu choose the appropriate calendar:
Click on the `+` (plus) symbol to add a calendar to access, click in the _Users_ box and start typing the calendar/user name. It will now search for a list of calendars matching the keyword. From the the drop-down menu choose the appropriate calendar: