Enables syntax highlighting in the integrated source code editors. Supports PHP, HTML, CSS and JS.
You can install it automatically in WordPress, by going in Plugins -> Add New, searching for Power Code Editor and clicking Install and then Install Now.
And here is how to install it manually : 1. Extract the zip file power-code-editor-X.zip 2. Upload folder 'power-code-editor' to the '/wp-content/plugins/' directory 3. Activate the plugin through the 'Plugins' menu in WordPress