To author text response questions:

The Author text response items window will open.

The Author text response items window will open.

Note: Once confirmed (Step B as above), the additional questions will be automatically added to your questionnaire.
The Add additional questions into your questionnaire window will refresh.

The list of additional text response questions will be displayed as shown by the arrow in the image above. You can view the questionnaire and if you are happy with how it looks, schedule and publish it