Logging in to public site manager.

I am unable to log in to site manager? It says my apple id is invalid, however, I can log in to the itunes store with that account. I was able to get in and change my theme, etc, but cannot log in to public site manager and add users. I'm so confused!!!! How can I get an email re-sent to the manager of our iTunes U site? When I first log in, it takes me to itunes the store and I can change my theme, etc and I finally appear in the store. I was able to add another user as an admin to create a course, but my institution and my course never appear in itunes U?