To select which calendars are displayed, please click the drop down arrow on the top right of the calendar. To add the calendars selected to your personal calendar, please use the plus sign button on the bottom right of the calendar. We hope this is a great tool for you!
If you are an iPhone user, after adding this to your Google account, please follow this link and update your settings to be able to show these events on your phone: www.google.com/calendar/iphoneselect