The custom User Name Password Validator in this sample MUST NOT be used in production code, it is for illustration purposes only. The batch file included with this sample allows you to configure the server with relevant certificates to run a self-hosted application that requires server certificate-based security.
It's hard to believe that MS never thought that someone might put in a wrong Username and need to type it in correct; as there is no way to type in a correct password for a wrong Username. People type things in wrong and need to be able to change it without reinstalling the entire OS.
Then, enter the same password you’ve been using to sign in to You Tube.
You're still signing into the same account as always—you just need to enter the email address on the account instead of your You Tube username. The password you've used to sign in is your Google Account password.
If you have no password, then just leave the field empty.
You can press TAB or SHIFT TAB to move between the User name and Password fields if you entered something incorrectly. i tried this and it errored out when i clicked okay.