Samsung PN51E6500EFXZA - Manual (Page 167)

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), select
the Caps or Shift button.
N To display symbols and punctuation,
select 1 . To redisplay letters, select
1 again.