First power the phone off and then press and hold the power button.
This is going to restart your phone in safe mode.
Use the TouchWiz home, the right side icon.
Swipe to the right to find kids' mode.
Open up kids' mode and it is going to be as if you have started a new kids' mode account.
Then set a new pin.
Please let me know if this does not work or if you need any other assistance.
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