Nancy - Following is my Calendar screenshot in Office365:
Next, I right click on OTHER CALENDARS and select NEW CALENDAR:
A new calendar entry is created with space for me to enter a name:
I enter the name and then right click on that calendar name and select to SHARE CALENDAR:
And that opens the following SHARE CALENDAR box:
I can't figure out how to add a calendar published by someone else? I have researched every help thread I can find and I don't seem to have the options. I added them previously, but now can't figure out how I did it.