Answer questions as an administrator
As an event administrator, you can answer the questionnaire for each participant by clicking on 'Event Dashboard -> Participants -> Questionnaire open / answered'. If you make changes there, no confirmation email will be sent. If you would like a confirmation email, simply click on the participant's login link and answer the questionnaire on the event website.
If a participant changes his answer from 'Yes' to 'No', 'Event Dashboard -> Participants' will automatically show that this participant has canceled their participation. In the detailed report you can also see in the column 'Canceled at', when this happened.