How to format Sitepoint book for Nook

I have purchased many of your books (in PDF form) and would like to read them on my nook.

I have been unable to do this because of an error.

How can I use a program like Stanza to put the book into a format that my nook can read?

Thanks

I’m not sure, what kind of error do you get?

Have you contacted SitePoint support for advice?