Changing the iTunes feed location

I’ve been attempting to change my iTunes feed URL from pointing directly at my WordPress site, and instead at my Feedburner feed. I know I need to add the iTunes tag:

<itunes:new-feed-url>https://feeds.feedburner.com/globalmobileonline</itunes:new-feed-url&gt;

But in WHICH WordPress template file should this go in (and where) so that when I Ping iTunes to check the feed it does finds the new-feed-url tag?

I’ve added the tag to the wp-rss2.php file, pinged iTunes, no change.

HELP?

Fred

The Global Mobile Online Podcast
https://www.globalmobileonline.com