How to I put an audio book from my computer onto my iPod touch4

Hi, I got an audio book from my library and want to put it onto my iPod but I'm not sure how to.

I downloaded the book onto my computer

It's an odm file if that helps

And the website said it was compadable with iPods

But when I hook my iPod up to the computer and view its "files and folders" then drop the file in nothing happens. It's the same if I try to drop it any where else.

Srry about spelling