I want to customize "contractor" and "client" headings in the proposal.

Is there a way to edit the signature block for proposals? 'Contractor' is not the most accurate reference for my work, and the signature name that it is defaulting to may be the one I signed up with, but it does not reflect the profile name I have set or my full legal name. Using my abbreviated first name looks unprofessional and at odds with the rest of the document, so I'm tempted to just send out a manual proposal instead of using this one.