iTunes podcast connect
The issue:

You need to accept the Terms &amp; Conditions for the iTunes Store.

Why?

When you attempt to login to http://PodcastsConnect.apple.com with an Apple ID that has not been authorized for use in the iTunes Store, you will get stuck in a loop (and thus, instead of logging into PodcastsConnect, you will be returned back the login screen).

The solution: 


Login to the iTunes Store. (In iTunes: click "Store" in the top >
Login. Accept the terms. On an iOS device: Settings > iTunes Store >
Login. Accept the terms.) You don't need to enter a credit card!
Login at https://podcastsconnect.apple.com/
Submit your podcast feed.


Bonus: Don't forget to check out the awesome Podcast Analytics