Added some instructions on mathjax latex plugin

wp-content/plugins/mathjax-latex/mathjax-latex-admin.php

@@ -152,7 +152,15 @@ EOT;
 	public function table_head() {
 		?>
 		<div class='wrap' id='mathjax-latex-options'>
-			<h2>Mathjax-Latex</h2>
+			<h2>MathJax LaTeX</h2>
+        <div>
+        You can embed LaTeX formulas in blog posts, either by using the [latex] shortcode:
+        <pre>[latex]E=mc^2[/latex]</pre>
+        or by using the standard MathJax syntax
+        <pre>$$E=mc^2$$</pre>
+        In this case, you <bold>have to</bold> a [mathjax] shortcode anywhere in the post,
+        or use the "Force load" option below.
+        </div>
 			<form id='mathjaxlatex' name='mathjaxlatex' action='' method='POST'>
 				<?php wp_nonce_field( 'kblog_mathjax_latex_save_action', 'kblog_mathjax_latex_save_field', true ); ?>
 			<table class='form-table'>