As an additional safeguard ensuring the authenticity of your signers you can assign each signer role a PIN, which they are required to enter before being able to start signing your document. A Signer PIN is added by clicking the Enable button next to the "Signer authentication disabled" prompt.
Here is a quick summary of how to set up a Signer PIN for your signers:
If you do not choose to add Signer PIN when creating your template, you will still be able to assign each signer a Signer PIN manually whenever you send your template document for signature (Signer PIN - Documents).