Choose the preferred screen lock type then select OK:
PIN lock code must be 4 digits.
Password lock code must be 4 characters.
Select Confirm lock code.
Screen locks automatically. You are prompted to put in your lock code to access your phone. To enter your lock code, press the right soft key then enter your lock code.
The default code is the last 4 digits of the mobile number or 1111.
To disable this option, refer to Unlock the Device - Kyocera Cadence.