Samsung UN75ES9000F E-Manual page 468

it will log you into your Samsung
account automatically.
N
If the TV recognizes two or more
registered faces, the Samsung
account list appears. Select your
account to log in.
N
If your face is unregistered, you
can register your face in your
Samsung account. Follow steps 6
through 7 in the "To register your
face to your Samsung account:"