Just Follow These Steps:
1. Click on settings.
2. Choose Mail, Contacts, Calendars.
3. Click “Add Account”.
4. A list of choices comes up. Choose “Other”.
5. Under “Calendars” at the bottom, choose “Add Subscribed Calendar” and paste the following URL in that field.
https://www.google.com/calendar/ical/actorsschoolusa%40gmail.com/public/basic.ics
6. Save