Adding help text
Each question can have help text applied, which will show as text underneath the question. Help text is useful for explaining to the customer what you expect them to enter into the question, and can prevent unnecessarily lengthy question text.
To add help text to a question:
In the preview of the page, click on the question.
The question will become highlighted, and the settings pane will open on the left hand side, populated with this question's settings.
In the settings pane, toggle Help text and enter some text into the text area that appears.
Click Update Question. The setting pane will close, and the help text will be visible in the updated question preview.