Follow the instructions on screen, after you have created the file, you have to open it with Netflix add-on by choosing the login with "Authentication key". Remember to delete the Authentication key file after login.
I managed to get this to work, by downloading the NFA KEY zip files on windows PC. Did the extraction, executed the application . It loaded Chrome browser which auto nivigated to netflix page, to which i put in my username and password. Chrome closed, and key was generated in same folder as application. It popped up with a PIN.
d3342ee215