Samsung LT27A750ND-ZA - Manual (Page 183)

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English
4. If you have entered the ID and password correctly, the Registered
Successfully message appears, asking you if you want to add another
service provider. If you do, press the ENTER E button. If not, press the
RETURN button and return to the Settings Menu.
5. If you pressed ENTER E , repeat Steps 2 through 4 to associate another
Service Provider.
6. When you are done, press the RETURN button.