itunes podcast feed - HELP

I have an existing podcast on itunes using a feed from a podcasting hosting service. I've outgrown the service and need to change to a new service but I don't know how to change my itunes feed to the new service's feed. I don't want to lose my old podcast episodes. If I have to upload the old audios to the new service, I'll do that... I just don't want to lose them. Anyone have experience with podcasts/itunes that can help? For clarity: I have a podcast that is already in itunes and I want to change the feed to my new podcast hosting service ## Deliverables just need to get the new service working with my old episodes ## Platform itunes podcast rss feed