Hmmm..... Maybe we should try something else.
The first question is: Did you register your Nook with B&N? You have to
plug in your Nook to your computer, and then go to their website and
register it. B&N will put a small registration file on your Nook, which ADE
needs to recognize it when it's connected to ADE.
If you've done that, then when you plug it into the computer, does the
computer show you that it found it? ADE won't find it unless it's
recognized by the operating system as "attached".
Then, when you bring up ADE, your Nook should show up in the left hand
(bookshelf) portion of the Library screen. If it does, then all you need to
do is to drag and drop the ebook from the right hand panel to the Nook on
the left hand panel.
Hope this helps!