Samsung UN65D8000XFXZA - Manual (Page 188)

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English
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4. Press the – button on the remote 3 times to change the input mode from
numbers to capitalized case.
5. Press numbers in sequence: 2 , 4 , 2 , 6 , 4 . A window will appear displaying a list
of words that can be entered using the selected numbers. Select “Chang” from
the list.
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If “Chang” cannot be found in the list, select + to create your own dictionary.
Add your own word to your dictionary