This tutorial works with 3 windows or tabs. In window or tab #1, login to the desired Google Account. In window or tab # 2, browse to the applicable calendar of choice which opens up a third window or tab with the desired calendar. A pop up window will appear where you choose yes or no to add to your calendar. Then finally, go back to window or tab #1 and locate the calendar that was added.

How to add a Google Calendar to Your Google Account:

1.       (Window or tab 1) Login to your Google Account

2.       (Window or tab 2) Browse to and open the applicable Google Calendar

3.       (Window or tab 3) Locate in the far lower right corner,
the Add to Google Calendar button (shown below)

4.       (Window or tab 3) Click the Add to Google Calendar button (shown above)

5.       The following window appears:

6.       Click Yes, add this calendar

7.       Switch back to the Google Account window or tab #1

8.       Locate & expand the Other Calendar section if it?s not expanded already

9.       Locate & select the calendar

Note: Calendars toggle on and off. To select or deselect a calendar, click it to turn it on or off