Using custom fields to display repeating text

Hi all,

I write product reviews and the product name comes up repeatedly. I’ve created a custom field for this but am having problems getting it to display. I added this to functions.php:

function get_custom_field_value($szKey, $bPrint = false) {
	global $post;
	$szValue = get_post_meta($post->ID, $szKey, true);
	if ( $bPrint == false ) return $szValue; else echo $szValue;
}

(Source)

Now here’s where I show off how little I know 😉 Can I just drop the code to call it into an html post, or do I need to use it in a template file?