Your workflow would go like this:
1.) Create media file, upload to Blubrry.
2.) Create podcast episode in Blubrry account with a description and title of the episode. The description can be 1 sentence or 10,000 words depending on what you'd like to do.
3.) Blubrry will automatically update your Blubrry-hosted RSS feed.
4.) Anywhere that's syndicating your feed (including iTunes) will receive your latest episodes as you publish them. This is automatic once it's set up. You don't need to do anything else.
You can now submit podcast feeds directly to iTunes thru
http://podcastsconnect.apple.com/ You will need to create an Apple ID (you can do this for free) in order to submit podcasts. If you've ever purchased anything thru iTunes (music, apps, etc.) you can use the same Apple ID you've used for those transactions, if you want.