If you want the person filling the form to use the Acrobat
Signature feature to sign the document, you add a Signature Field
object to the form design.
In the Object Library palette, click the Standard category
and then drag the Signature Field object
onto
the form below the Terms and Conditions section.
Select the Signature Field object text and type
Authorized By
.
In the Object palette, select Underlined from the Appearance
list.