If you've forgotten your Netflix password completely there is no way that you can find out what your password was. To gain access back to your account you must click on "Need help signing in" and provide your email to receive an email back on your login information. From there follow the instructions on the email to regain access to your account! Good Luck! :)
You forgot your Netflix password? Usually, people have the opposite problem... They login to someone elses device, and it remembers there password. Then they can watch stuff for free while you continue paying. Maybe you could ask a friend for their password. I think you can login to 3 different devices with the same password before they get suspiscious.