Samsung PN51E6500EFXZA - Manual (Page 290)

8. To start an application, select an
application using your remote.
Using the Keypads and Keyboards
A number of Smart Hub applications
display a numeric keypad or a QWERTY
keyboard so you can enter account
names, passwords, and other data.
In most applications, you can toggle
between the numeric keypad and the
QWERTY keyboard by selecting the b
button.