public library books not in ADE

I make the mistake of downloading books from the public library before i had the adobe digital ed. downloaded. So I downloaded ADE.  ADE recognized my nook. But the books from the library are in my computer documents, not anywhere  on my adobe digital ed. page. and I don't know how to get them to go to ADE. So i tried checking out another book, after i downloaded ADE, but it isn't in my adobe digital ed. Now i have 4 checked out books, but can't read any of them, because they are not in my ADE, and not on my nook. GRRRRRRR! 3 hours later...... can anyone help me?