If you want to change the url of an already submitted podcast (feed) in iTunes, this plugin will help you out.
Please follow the steps on the "Installation" Page
Just deactivate the plugin or remove the redirection url from the "New Feed URL"-field
It may take a while till iTunes picks up your new feed and changes the url to the new one.
Please check your feed with the W3C Feed Validator (http://validator.w3.org/feed/). If there is an error, you maybe activate or deactivate the namespace.
If you activate the namespace please make sure that it's not already added to the feed from another podcast plugin. Double-Adding the namespace will cause the error.
The error will also appear when you're using the redirection plugin without a namespace. In this case check your feed with the W3C Feed Validator mentioned above and test what works for you.