Access this dialog box from File > Options > Signatures > Creation & Appearance when you click More and then New or Edit.
It offers the following controls:
Title: The name of the signature
Configure Graphic: Choose a type of graphic to appear in the signature field. You can add no graphic, import a graphic from files, or show your name when you sign.
Configure Text: Choose types of text to appear in the signature field. There are Name, Location, Distinguishing Name, Labels, Date, Reason and Logo as options for signature field content.
Text direction: Choose left to right or right to left (for Asian languages).
Preview: Lets you preview the signature field that will appear on the page.
The Signature Preferences panel offers further signature creation and validation choices.