How do I use this feature: Additional Calendars Pack

This in app purchase unlocks several features within myCal, specifically the ability to search and add external calendar subscriptions, right from within the app itself.
The features include:
The features include:
- Search for several types of external calendars, from National Holidays from around the world, to Religious Calendars, Sports, and others
- If the required calendar is not in the list, optionally Request for the calendar to be added
- If you already have the a calendar URL, you can enter it and add the calendar immediately
- To search for a calendar
- Tap the Settings icon in the toolbar
- Tap Calendars
- Tap Add External Calendars
- Scroll the list to see the available calendars
- To request a calendar that is not already in the list
- From the above list, scroll to the bottom and tap Request A Calendar and enter the required details
- To add a calendar for which you already have the URL
- From the above list, scroll to the bottom and tap Enter iCal URL and enter the required details