You mention the three steps below. I was able to get it working. One of the things that I was doing wrong in the server behavior was to change the key, which of course, if I had thought about this at all, the key should remain set at "UserID". I properly set the new field in the second page of the server behavior wizard. Even after your instructions below, which were very good, I was still having trouble displaying the results, even though they were being posted on the database. I went into bindings, and made the mistake of connecting to the Forms database rather than the lightning bolt database. I finally figured out that I was not connecting to the data, and changed the binding to the users database rather than the form field file. I can be confusing.
Question, do I need to update both the server behavior and the binding each time that I introduce a new form field in the Profile?
Thank you for your clear and quick response. Very helpful.