Whenever you edit your podcast information in your podcasts.com account or upload a new episode to podcasts.com then that will automatically update in your RSS feed.
Once your RSS feed updates with the new info or episodes, then your listings will also update! Each directory refreshes their feeds at different times throughout the day so it might not update immediately. But you should see all the changes reflect within 24 hours.
If you notice it has been longer then 24 hours shoot us an email at firstname.lastname@example.org and we will look into this for you!