You can change the calendar that your appointments are added to on either a global scale or event level. Go to your events dashboard and choose and select an event to edit. Once this is done, you can choose a different calendar from the calendar drop-down menu.
If you'd like to make this change on a global level instead, you’ll need to visit your profile settings. Once you are within your profile settings, you’ll need to select the item on your side bar marked calendars. You should now see a box labeled Add to Calendar. Within this box is a drop-down menu that you can use to set change the calendar bookings are added to on a global basis.