To author your own additional Likert scale questions, OR compile (that is, select questions from banks of existing questions) additional Likert scale questions:

The Add optional items into your questionnaire window will open.

The Author Likert items window will open.

The Author Likert items confirmation window will open.

Note: Once confirmed (Step B as above), additional questions will be automatically added to your questionnaire.

The Add optional items into your questionnaire confirmation window will open.

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

The list of additional authored/compiled 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