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