If you have been instructed to notarize a document that doesn’t have a signature line, that is a cross between a quandary and a conundrum.
You cannot notarize a document without a signature. Notaries notarize signatures on documents, not documents, and especially not documents without signatures. And you cannot have a signature without a signature line. But, it could be construed as UPL for a Notary to add a signature line to a document. So, now your ability to get the job done is really on the line — which unfortunately doesn’t exist in this case, until someone writes one in.
So, what do you do to get the document notarized? If the signer draws a signature line, then they are the one engaging in UPL, not you, especially if you do not advise them to do so. The bottom line (no pun intended), which is the signature line, is that without a signature, there can be no Acknowledgment or Jurat on a particular document. An Oath or Affirmation are the only Notary Acts you can do without a signature.
So, once a signature line has been added, the affiant can sign, and then you can notarize the signature on the document.
But, what if you have a signature without a document — that is an entirely different question.>