where do i have to insert the cryptx code?

sorry for this basic question. i couldn’t find any step by step description

where do i have to enter the following code?? so that i can create like a link in my menu bar?

thanks for help
martina

<?php
$content = “[email protected]”;
$args = array(‘text’ => ”,
‘css_class’ => ”,
‘css_id’ => ”,
‘echo’ => 1);
if (function_exists(‘encryptx’)) {
encryptx($content, $args);
} else {
echo sprintf(‘%s‘, $content, $args[‘css_id’], $args[‘css_class’], ($args[‘text’] != ” ? $args[‘text’] : $content));
}
?>