If you have already submitted your feed once, Apple will automatically refresh your feed within a day or two. You do not need to resubmit your feed to Apple; all changes to your podcast (including changes to artwork, description, and episodes) will propagate to Apple within about 24 hours.
How can I resubmit my feed to Apple?
Updating your feed with Apple after making changes to your podcast

Written by Matt
Updated over a week ago
Updated over a week ago