@NickTheGreat you can reset the lockout by restarting Blue Iris (if you run it as a service, you need to restart the service via Task Manager or the Windows Services control panel). It may also be possible from BI's status window, but I am not sure.
The user name and password need to be exactly what you set up in Blue Iris Settings > Users.
The user name and password need to be exactly what you set up in Blue Iris Settings > Users.