If you need to lock out the installation settings of your Zone navigate to Settings>System>Passcode. Click 'Require Passcode' and enter a 4-digit pin. Once entered you will be asked to confirm the passcode before proceeding.
Returning to the WebApp Home Screen you will now see a lock next to the Settings button. Click the lock to enable passcode entry to the Settings section.
Note - entering the Settings using a passcode will unlock the section. You will need to re-lock it after making any changes.