The preview post doesn't show the user name with blog link next to it... how do you know if you've loaded the correct url for this feature?
Its easy. By trial and error,you just put the link and then press OK. Go to any section,then post a thread,then you'll sell the blog link appear behind your user name .
If you're having trouble finding the XML link in your blog, you can sign up for FeedBurner and use that link instead.