Properly chastised by Neil Bartlett for not labeling my Y Axis on a graph, I added such a title to my next attempt. I then cut-and-pasted that image, which resulted in this being pasted into my blog editor:
And yet, I had already typed the Axis Title, as this screen capture of my Excel chart shows:
Now if only I could also figure out how to add a title for the X axis! Thank God for the Ribbonbar!