Moving this discussion to the Adobe Digital Editions forum.
ADe does not support iPads or iPhones directly, so you can't connect them
to your computer and just do a transfer.
What you can do, however, is to locate the ebooks on your computer (usually
in the Digital Editions folder) and then use iTunes to transfer them to
your iPad. That seems to work for most people.
If you want to bypass your computer and import the ebooks from a source
directly into your iPad, you could try another ebook management program
like Bluefire Reader, which does support iPads.
Hope this helps!