my rss does not working! plz help

hi
I wanted to transfer my feedburner from google to my host.then I create a Cname and chosen feed.picor.ir for feedburner.but it didn’t work then I deleted my feedburner and Cname in my domain to try it again.
but the problem is when I enter mysite.com/feed (picor.ir/feed) it shows me “This is a placeholder for the subdomain feed.picor.ir” !!
what should I do now ? I want to re-creaate my feed just like befor
please help me