This tutorial assumes that you have completed the creation of an iCal feed and you have the feed URL at hand. For more details see Creating an iCal feed.
1. Open the Mac Calendar application (or iCal) and select "New Calendar Subscription" from the File menu.
2. In the overlay that appears paste the iCal feed URL and click Subscribe.
3. Enter a name for the calendar subscription, then select 5 minutes as the Auto-refresh interval and click OK.
Upon completion, a new calendar will appear in the left sidebar and the events will be imported. Every 5 minutes, your calendar application will load new events from YArooms and keep your calendar up to date. If the calendar location is left as iCloud and you have other devices (like an iPhone or iPad) synchronized with your account, these events are also be visible on the device and reminders will work.