How do I get my calendar to show holidays automatically?

If you want U.S. holidays, you can subscribe to a holiday calendar as follows:

1. Tap Settings
2. Tap Mail, Contacts, Calendars
3. Scroll down and tap Add Account...
4. Tap Other
5. Tap Add Subscribed Calendar
6. In the server field, input: ical.mac.com/ical/US32Holidays.ics - then tap Next
7. On the next screen, change the name of the calendar under "Description" if you choose - then tap Save

You're welcome. (BTW, you won't see this Calendar on icloud.com as it does not sync subscribed calendars, but you can add it to any of your devices.)

I am getting prompt for username and password?? I cant get this to work for me on ios6.1