USB port operation

I just bought the world edition 1tb Nas device and I like it so far, I have a few questions,first how do you set up user accounts second how do I use the USB port my .500gb external Hd is connected but it says its not. And it says I can register 5 Mio Net accounts,do I have to pay after 30 days in order to keep using remote access

You can create user accounts on the drive through the Network Storage Manager (web interface).  Does that detect your USB drive and if so, assign it a share?  You don’t have to pay for MioNet to access your drive but please see the link below for more information.