How do you fix a bad URL address

I was trying to redirect my feed to another feed url and made a mistake in the feed address. I typed in HTTP:// twice so the feed isn't valid. I have tried to redirect the feed by using the <itunes:new-feed-url> but it isn't taking. I fear that since the feed is now pointed to an incorrect url the update is being rejected by iTunes and therefore the redirect isn't working? Is there anyway to fix this or is there a way to contact Apple to have them manually fix it?

G5 Quad Mac OS X (10.4.8)