Here's how to get your AOL Calendar on your iOS device:
1. Tap Settings.
2. Scroll down a bit and tap Mail, Contacts, Calendars.
3. Under 'Accounts,' tap Add Account…
4. Even though you will see AOL in the list, go to the bottom of the list of options and tap Other.
5. Under Calendars, tap Add CalDAV Account.
6. Tap in the text fields to open the keyboard and enter these details:
• Server – Type caldav.aol.com
• User Name – Type your AOL email address
• Password – The password for your AOL account
• Description – Whatever you'd like to call this calendar. AOL Calendar? :-D