Their signature also has to be notarized. Learn more about what a Title is, how to get a Title, and how to transfer or sell a Title.As a Notary, how do you stay impartial if the signer is your relative? The owner must sign the title certificate as the seller. Fill out, sign, and affix your official seal to the Notary certificate. The wording requirements for acknowledgment certificates vary from state to state. A notary cannot notarize a title without the seller's signature.