If you have a desktop application that supports iCalendar Subscriptions - like Apple's iCal or the Mozilla calendar - you can use this page to set up a subscription.
Include Events from Add-Ins?
If this calendar requires a password to View, enter it here.
The password will appear in plain text in the subscription URL.
If you change your web calendar password, remember that you'll need to resubscribe here with the new password, or change the URL in your desktop application.