How to add source code into wordpress post really?

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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]