Samsung PN51F5300BFXZA - Manual (Page 24)

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To block certain content, you select a lock, and press ENTERE (That
is, you “click it”.). For example, click the 18+ lock and you block all TV
programs rated 18+ . The rating categories are also grouped so that
clicking one category blocks all the categories a parent would block along
with it. For example, if you block the
G category, then PG, 14+ and 18+
will automatically be blocked.
N To unblock a category, click the lock.