Adobe Ditigital Editions: On a Macbook, the Authorize Adobe ID menu option is not present.

Hi,

I installed Adobe Digital Editions (the current downlodable version) on a Macbook.

I need to authorize an Adobe ID, but there is no Help/Authorize menu option in the window, so I cannot proceed. In fact there is no button whatsoever apart from those for adding items to the library.

How can I solve this?

I had no problem authorizing the same ID on Windows.