Device Trust Name editing

Just installed Norton Security and found that the Network Security Map feature has been removed and replaced with Firewall Network/Device trust.

In device trust all existing devices on the network have the name "NEW".

Please can someone tall me how to edit this name to the real device name. There is no point having everything called "NEW".

I tried deleting and adding an existing device, but I could not select the device to delete, and it will not allow you to add a device that already exists on the network.

Am I missing something, or is this just not working?

Thanks

Steve