Page addresses

What have I done wrong? I’ve created a blog with a static page and no blog posts. I want it to be like a website but with some of the functionality of a website. I’ve created new pages but when I test them, i.e. the guest book for example, after posting a comment and pressing submit it says it can’t find the page – the page has been given a number but it’s trying to find /guestbook/

http://worth-more-than-rubies.com/?page_id=11 is the URL. I would have preferred the pages to show without the page ID but I couldn’t find a way around it.