To edit the questions click the magnifying glass on the table row.
Be sure to click save after making any changes.
If you add Form Questions after registrations open you will need to contact those who have already registered asking that they respond with the answer to the Form Questions. To get a list of those who registered prior to adding Form Questions, run a detailed registration report.
When they respond you can then look up their registration and use the Veiw/Edit Registration to update their registration with their response.