When generating a report for a prediction, a number of sections will contain the text “Not provided by the user”, which means that you haven't entered any text in this field.
In order to do so, return back to data matrix, make a right-click on the prediction and select “Edit prediction info”.
A new form (allowing editing of some fields of the prediction) will appear. You can enter your own comments in the editable fields.
Then click “OK” to accept the changes and produce a new report for the same prediction. Your text will appear in the report.