Change template is one time thing. After that, whenever you need put codes into blog, in HTML mode, put codes between
<pre class="brush:java"> ... </pre>
<script type="syntaxhighlighter" class="brush:xml">
</script>
You have the option to change the type of language, just as we are using java here, here is the list of the supported languages.
class='brush:java'
class='brush:as3' //action script 3
class='brush:bash'
class='brush:css'
class='brush:groovy'
class='brush:js' //java script
class='brush:py'
class='brush:sql'
class='brush:xml' //xml, xslt, html
My Template: add before </head>