Thank you. I think I am almost there.
Now I have the appropriate IP address on the Brennan window and a small penguin labelled BrennanBTube:root as a device in Computer.
When I click on the penguin a range of folders appears: Browse folders, Music folder, Picture folder, Video folder.
When I click on, for example, Music folder, a new range appears, Albums, Artists etc.
However, the folders all say they are empty, when there are many tracks on the BB1 loaded via a usb, which play perfectly.
Presumably I am doing yet another thing stupidly and again hope you can put me right.
Cheers,
Alan