cannot disable lockdown

Hi I fear I have blundered here. I have purchased and installed Inteset multi application v2. I have set up the various options while I am waiting for my activation key to arrive and started the lockdown in trial version to test without setting a password.
Now when I login, the checkbox to disable the lockdown is not available (greyed out) until I enter a password. but as I didnt set one I have nothing to enter and it wont accept a blank field.
How do I overcome this please?

Is secure Lockdown enabled? If you didn't set a password, the "Enable Secure Lockdown" will not be grayed out.