Beg pardon Meeera, you are right on the button there. Did not expect to find it in the Miscellaneous section. Still no excuse.
Anyway, complete success once I had downloaded ADE, created an Adobe ID, booted up calibre, added the epub file from its location in My Documents, sent it to my smartphone device, booted up Aldiko, touched 'Files' and imported my book once I had opened it after giving my Adobe ID and password.
Now a very happy bunny.
Thanks to everyone who posted.