[Plugin: Shortcodes Ultimate] Using Shortcodes inside theme

Hello,
thank you for this great plugin.

I have to add a box at the bottom of my posts, more than 600. Its going to be hard doing it manually so I wonder If i can put the shortcode box inside a template file.

I have been using this but it does not work. I am not very good with code. 🙂

<?php
$my_box = '
[gn_box]
   [gn_box title="Rectificación de datos" color="#f00"] blabla bla bla bla bla  and then a link inside shortcode <a title="Contacto" href="http://www.example.com/page/">enlace </a> [/gn_box]
[/gn_box]
';
echo do_shortcode( $my_box );
?>

I have been using my_box as I see another post relating to this that was using my_tabs for the shortcode.

Thank you

http://ww.wp.xz.cn/extend/plugins/shortcodes-ultimate/