As already advised the No Signer fields cannot be assigned to any signer and usually serve the purpose of adding text, checkboxes or pre-defined signatures to a document. No Signer fields cannot be changed by your signers during the signing process and are displayed accordingly.
The following fields are supported:
Example of how to use it:
if you need to add a signature in order to "pre-sign" a document you can use the signature field and add your signature to the document
additional text fields can be added that are not assigned to any signer for more clarification and information on the document