If you want to change the Store to using your new feed the correct method is to add a special tag to the old feed and leave it place for a couple of weeks. However the feed is now working again when you subscibe to the Store page. This looks for the feed at
http://theshoow.hipcast.com/rss/anteateracademy.xml
and there are two episodes in this which appear when subscribing. You originally said that you wanted to use the feed at
http://theshoow.hipcast.com/rss/theanteateracademy.xml
and there is now no feed there. So currently you have a working feed, but the Store hasn't had time to catch up with it yet. If you just wait, those two episodes should appear in the Store.
If you really want to change to the new URL you will first need to make sure that you have a proper working feed at that URL. Then you can use the process described here:
http://wilmut.uk/move
Personally, I'd leave it alone and use the existing original feed. If you are experiencing any problems with that just say what they are and I'll have a look at it.