WordPress.com Stats – theme adjustment?

Hi,

I’ve installed “WordPress.com Stats” but the stats don’t start showing up. According to the FAQ I should do the following with my theme (Graydream):

“Your theme must have a call to <?php wp_footer(); ?> at the very bottom right before the </body> tag.”

– in which file should I do this? Just in the index.php or in all files under ../themes/graydream/ ?

/Kalle