WPBook install problem

Problem installing WPBook

I am setting up a site at domain.com/wordpress and have a Facebook page.

I would like to be able to (easily) publish posts as well as pages I create in WordPress to the Facebook Wall, so that followers on Facebook are automatically informed that something has changed.

I hav tried to install WPBook, but whenever I try to create the application at http://www.facebook.com/developers/ it fails.

Any idea how I can create the application in another way?

Also…
I am a bit comfused about this quote in the README

Set the callback url to your blog url, including a trailing slash.
(http://www.yourblogurl.com/)

My site is at domain.com/wordpress, so does that mean I shall set the callback to domain.com/wordpress/ ?