Podcastics do not have a user interface from which to set up a 301 redirect. Therefore, to migrate your feed, you must email the Podcastics support team at podcast@support.podcastics.com asking them to set up a 301 redirect from your Podcastics RSS feed to your new RSS.com feed.

Here is an email template that you can use:

Hi Podcastics Support, 

I'm moving my podcast to a new host provider and kindly request that you apply a redirect for the following show (Insert Your Podcastics feed Here)

Can you please apply a 301 redirect to my new RSS.com feed at (insert your RSS.com feed here, for example, https://media.rss.com/myRSSfeed/feed.xml)

Please let me know if you need any more information

Thanks in advance.