Samsung UN55FH6200FXZA - Manual (Page 141)

5. To set up wireless security, enter the
Security Key or a WPS PIN using the
keyboard on the Enter security key
screen.
N
To enter letters, highlight and
select each letter. To enter
numbers, highlight and select
each number or press the number
buttons on your remote.
N
To shift to capital letters (or from
capital letters to lower case),