PHP code not working? putting wordpress on existing site

Hello,

I’m not very familiar with PHP. I had implemented a wordpress blog once, in the past. I cannot find those backup files to learn from, so I started all over again, by reading this:

http://codex.wordpress.org/Integrating_Wordpress_with_Your_Website

And so, I want to put my own wordpress blog onto my existing website. I tried following:
> put header code at the start of your html file
> include/be aware of The Loop
> copy and pasted code from the above link, for my website to display the last 3 posts from my wordpress blog.

My website’s blog page is located here:
http://www.rocky-art.com/blog.html

I’m wondering if I’m missing anything in my PHP coding? Or did I do something else wrong?

I appreciate any help! Thanks for reading 🙂