downloading ebooks

I just bought 2 ebooks from LVA Store. I was able to download 1 (I need to call when store is open regarding the other), but am unable to transfer it to my nook. do you have any idea how to do this?
There may be some sort of App that lets you transfer a PDF (which is what you get with the version of e-books we sell) so you can see it on the Nook, but you can't convert it into the Nook e-platform. Our e-books are mostly for people who don't have a reader of some type. If you have one, you should buy from that store for full functionality and probably best price.
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