For my Dimension 4 (Model number NN-C877W), you turn on the child lock by pressing 'Start' 3 times. To turn it off, press 'Stop\Cancel' 3 times.
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Function > 5 > 1 should lock it and Function > 5 > 2 should unlock it.
If this does not work, please reply back with your brand and full model number so we can pull the owner's manual for you.
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