Samsung LT27A750ND-ZA - Manual (Page 178)

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English
4. Select Password , and then press the ENTER E button. The Password
window and a keypad appears.
5. Using the keypad and your remote, enter your password. When done, press
the ENTER E button, select OK , and then press the ENTER E button again.
N If you want Smart Hub to enter your password automatically, select
Remember my Smart TV ID and password after you have entered your
password, and then press the ENTER E button. A check appears. Smart
Hub will now enter your password automatically when you select or enter
your ID.