not posting

Hi I have the plug installed, activated and a page created with short code. The form shows on the page, but when I make a guest post. it goes to homepage and post cant be found. if I go back to the guest post page I get the editor and no posts.

demo site http://kalkaska-mi.us/wpress/guest-book/

Thanks

Rick

http://wordpress.org/extend/plugins/guest-posts/