Redirect not working

Hi,
I’m trying to redirect after submission. After following the faq (https://contactform7.com/redirecting-to-another-url-after-submissions/), I am having trouble figuring out where to past the following code:

“<script>
document.addEventListener( ‘wpcf7submit’, function( event ) {
location = ‘http://www.3dpdms.com/sorry&#8217;;
}, false );
</script>”

Right now I have that pasted in the main page template (index.php). Is this correct?