I received my first AddThis Analytics Report by e-mail, shown below somewhat compacted for space considerations:
There were no clickbacks. If someone shares my blog post using any of the AddThis buttons, and the recipient visits my site as a result, it’s counted as one clickback. On the chart, it said, “Important: This feature must be enabled.” I had checked the box Enable clickback analysis at the very beginning, but clicked About clickbacks for more information. It said that certain code had to be included, and “addthis_config” must only appear once in the code, but it didn’t define exactly where to place this new code:
Note: You may wish to review the previous post, AddThis Analytics for Share Buttons in your Blogger Blog, for more context in code placement.
I previewed the blog, and everything was working properly: AddThis share buttons were in place and the text of each post had not been removed. I don’t know why the initial checkmark for Enable clickback analysis didn’t add the code, but is should work properly now.