You can add labels / tags to describe 'text' and 'paragraph' fields which you can place on a document you are about to send for electronic signing. To assign a label drag and drop either the text or paragraph field, click on it and edit the label field which appears in the panel on the left hand side, as shown on the picture below.

Labels are ideal if you require your signees to fill additional data fields and their content is not obvious from the context in which whey were placed.