To add a calendar using its address, follow these steps:
1) Click the down-arrow next to Other calendars
2) Select Add by URL from the menu
3) Grace for Dover’s iCal address is: https://www.google.com/calendar/ical/ndsnj3dbkjmepqgeb2vg2qnsr8%40group.calendar.google.com/public/basic.ics
4) Enter the address in the field provided
5) Click the Add Calendar button. The calendar will appear in the Other Calendars section of the calendar list to the left.