Ok, this is going to make things tricky because only authorised sellers can do the password reset for you, as you bought from eBay your only option to regain access to the browser access will be to hard reset the NVR from the direct monitor menus, set the NVR up from scratch again and make a note of the login password you set. You should then be able to log in with a browser to access the cameras directly and adjust the white light settings.