How to get book from nook app onto computer?

I just bought a book from barnes and noble for the 'nook' and since i don't have a nook i just downloaded the iphone app. I can read it on my iphone but it's really annoying and difficult so i was wondering if anyone knew how to somehow transfer the book onto my computer.
i realise there's nook for mac or pc but for the book i bought it says that they don't have the online option yet.

What online option?

Get the app for your computer! They will sync it to the same account on your computer!

If you want to read your nook books bought from barnes and noble on your iphone you need this, otherwise you can't read:
http://www.epubsoft.org/nook-drm-removal.html
hope you can get help.

Install the Nook for PC app from http://www.barnesandnoble.com/u/nook-for-pc/379003591/ and registerit to use the same account.