I want the book I paid for downloaded into my device so that wouldnt have the need to come online to read my book, I paid for it.
Sorry, that wouldn't be possible. You cannot download the book into your device. You can only download it into your okadabooks shelf and read from there.
The good news is, you can read both online and offline, in the app. See how to download purchased book (s) into your app library here: http://discuss.okadabooks.com/t/how-do-i-get-the-book-i-paid-for-how-to-read-on-okadabooks/360