Okay ... here's today's stupid question.
How do you unmount the Kobo from ADE?
Last night I successfully downloaded a book from the library ... and it "seemed" to transfer it to the Kobo ...
[I was positive I saw it in the "I'm Reading" list when I disconnected from the computer ... but the new book wasn't there this morning! 
] ... but I was unable to find any "unmount" or "eject" option within ADE.
I tried to use the "my computer" spot to eject the Kobo ... but when I try to do that, I get an error message.
I'm thinking that the reason I can't find the book on my Kobo today was a syncing problem ... due to improper "unmount".
So ... what am I missing?
I've searched ... but so far I've only found references to "unmounting" ... not how to do so.
Thanks
Mary