Using Netcam Studio with Let's Encrypt Free TLS/SSL Certificates

yes I am acting as administrators. From what I see there is a way to set or associate a password with pfx files.
Steve D in his directions

Running Netcam Studio Server on SSL / HTTPS - Windows 10 and 11

writes about adding these lines to the config files. I assume that server.pfx is the name of the pfx certificate file. I can do that, But were does “WebServerCertificatePass” value “test” come from? Do I set it somewhere? Where and how is that set?

<add key="WebServerCertificate" value="server.pfx" />
    <add key="WebServerCertificatePass" value="test" />

He does describe a process for self created certificates, but I am using the Certbot path.

Kent