Login with fingerprint kodular + firebase

Hi, I’m making an application using kodular and I would like that besides doing the sign up (main screen) through e-mail and password, it would also have the option of fingerprinting the cell phone itself. I would like the fingerprint registration to be through the register screen (sign up).
Another thing I would like to do is to not allow the person to rotate the screen horizontally, because I don’t know how to do that.
Database= Firebase


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