How to add source code into wordpress post really?

Ok, I have read and followed the instructions as written in this link:
http://en.support.wordpress.com/code/posting-source-code/

I have tried all other the solutions, including reinstall the whole wordpress site, installing syntax highlighting plugins etc. but it just din’t work ?! Below is my published post in Twenty Thirteen. My post still display the code block as plain text as you can see.

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My post still display as plain text

Edit:
I’m using self-hosted WP and installed (and activated) SyntaxHighlighter Evolved

It worked with single line code, but below is what it showed when I typed multiple lines of code:

enter image description here

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1 comment

  1. Since you are self hosting the blog, you will need to:

    1. Install the SyntaxHighlighter Evolved plugin.
    2. Make sure that you enable the plugin on your blog (this is not done automatically after install).

    You should now be able to add the code to a post or page via either the visual or text editor.

    [code language="css"]
    your code here
    [/code]
    

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