Log into your Mango Display account.
Click on the display you'd like to edit.
Once you're on the display window, click the edit button on the calendar widget.
A window will pop up. Select 'Add Calendar URL (iCal or ICS)'.
5. In the next screen, paste the any public iCal or ICS URL, and click 'Connect'
6. Done! Your iCal or ICS calendar is now connected.