Q: Switch Podcast Connect Log-In's?

You could contact Support. Go to https://itunespartner.apple.com/en/podcasts/overview and click the 'Contact Us' link at the bottom of the page. Possibly you will need to get them to cancel the submission then you can submit it with the correct ID, though you may fall over the bug which will tell you it's already been submitted - only Support will be able to sort that one out.