I am trying to create a 3 field login form: Account ID, Username, Password. When the login button is clicked Account ID and Username are concatenated (seperated by a hyphen) and then passed for standard DNN authentication.

I am following DotNetNuke Tips and Tricks #12: Creating your own Authentication Provider but don't understand the following paragraph:

The next set of changes are made to the settings control.  We need to make sure that we are saving our control settings using unique settings keys (although you are free to store your settings using whatever method you are comfortable with).  In this case I create a new DemoAuthConfig class to replace the core AuthenticationConfig class.  I then go back and update the settings and login pages to reference my new config class rather than the old class.

How do I create a new DemoAuthConfig class to replace the core AuthenticationConfig class?