Podcasting on iTunes with WP

Now that iTunes music store accepts podcasts – and I have a podcast, my question is where (and how) do I add the iTunes specific XML tags? The example from apple is at: https://phobos.apple.com/static/podcast_specifications.pdf

My RSS feed is at: feed://www.wachs.org/weddingcast/wp-rss2.php?category_name=podcast So I am guessing I need to add these to wp-rss2.php, correct? It also seems to use specific XML tags for each podcast that I upload. How would I do this at the blog level (vs. the global level on the php page)?

Thanks.