A. To unlock the control panel, please follow the instructions below:
1) Press the setting button then scroll to general and press enter
2) Go to operation lock
3) Then turn it off
For more information on operation lock, please view ‘Operation Lock’ on section EN-44 of the manual below:
https://support.casio.com/storage/en/manual/pdf/EN/008/GP310_usersguide_A_EN.pdf