How can I Use HTML Editor in the Design and Sign Section, to Create Forms?

Navigate to the list of form types within the Design & Sign section via the steps below:

Admin > Design & Sign > Form Template

From here you can choose a specific form or create a new one, as you would normally do for any Design & Sign template (see screenshot below) and begin adding a section for a question, paragraph etc.

Now we have added HTML Editor within these sections so it's easier to make changes to text such as colour, style, font etc. (see screenshot below)

Once the form is completed with the desired style output in each of the sections, navigate to the save icon at the bottom of the form.

For further reading please see the below articles:
How to download a Design & Sign form

How to design a form template on Design & Sign