I download a book, can't open it, and don't how to check it back in
Acct 2 3149 00558 1878
First of all--with ebook downloads, you never have to worry about overdues, because the book automatically returns itself when due.
Are you downloading it from the Overdrive app? (If you are not, that is probably why it doesn't open.) Depending on what device you are using, there may be different ways to return a book early from inside the app. Have a look at the Returning and Removing Ebooks topic (last one) here: http://help.overdrive.com/customer/en/portal/articles/1481726-get-help-with-ebooks-from-your-library
Let me know if this helps, or if you have any more questions!