How do I change the color of my events or make my calendar private?

As long as the calendar is listed under "My Calendars" and not "Other Calendars", you have the ability to change the color that your events are, along with change the permissions of the calendar.

Click the little triangle to the right of the calendar name, and go to Settings. 

Make any changes needed, and click Save. 

If the calendar is shared, the changes will be visible to other users once they refresh their page.