The first time you login to Noah after enabling the security system, the login will still have the password box grayed out. At this point the login system is not aware of the new status, that Noah requires a password at login.
When you try to login with no password entered you will receive an error that the login is invalid. Now Noah is aware of the updated requirement.
At this point the password box is available and you will be able to enter the required password and complete the secure login to Noah System.