The only way to not have a password, pin, etc., is to enter the one you have, then go into the device's settings and enter it again to make the change. Then you choose not to have it.
1. Tap "Apps" and then tap "Settings".
2. Locate and tap "Lock screen and security".
3. Now tap "Screen lock type".
4. Enter the PIN and then tap "Continue".
5. Now tap "None" and you should have it turned off.
If it doesn't work for you, then you may want to contact the manufacturer.