Hi thanks for your response.
My preference is for a wireless connection, I have tried the USB lead in desperation.
I use an intel mac and at the moment I don't see the Calibre disk mounted in finder whether I am using the USB lead or hoping for a wireless connection.
I think, no I know I am confused! I understand that Calibre has a server which I could access via the net. This is not what I am after, I just want to be able to load books to my Kobo without using the USB lead from Calibre on my mac.