In the future utilize the webdesign forum at
microsoft.public.publisher.webdesign
You don't specify your version nor state what the problem is.
I'd have to recommend you start by going over my tutorial at
www.davidbartosik.com/ppt.htm on uploading to identify if you are following
the correct procedures.
If afterwards you are having a specific difficulty post as such in the web
forum for follow-up.