CSS HTML Validator Support

I'm new to Html and understanding how it all works my site is dynamic http://www.advertisingtheworld.com I'm trying to figure out how to correct all pages I put url in CSE HTML Validator I was able to figure out how to repair front page but cant figure out the rest since they are data base driven ho...

Got It Now

need to help to download payed product keeps telling me:
Cannot find your registration in the database. Did you enter your correct registration and pin number?
can you help with this