Subscribing to a Podcast with Itunes
1)Click on the Advanced tab in iTunes and select Subscribe to Podcast.
2)Paste the copied address into the URL below into the window of the Subscribe to Podcast dialog and then click OK to subscribe.
iTunes will generate the Podcasts screen with information about the podcast.  By clicking the small arrow beside the name, it will expand and show all the available audio files. If the podcast has several podcasts available already, the latest will be downloaded. Any podcasts that did not automatically download will show a GET button next to the filename – click the button to get that particular podcast. Or you may click the GET ALL button.
Now plug in your ipod and iTunes will check for the latest podcast. If a new podcast has been posted, it will download this automatically. You can also manually click the UPDATE button to check for the latest files.