Hosting and Servers

I used the help page http://youhack.me/2010/04/01/building-a-registration-system-with-email-verification-in-php/
Changed the database name to DataBase name: 819903
DataBase username: 819903
DataBase password: equal with account password
DataBase host: localhost
But receive the following error after filling the registration form that hosted at myproject.6te.net  and receive the error Database Error Occured Query Failed .
You can test it at http://myproject.6te.net/ and give suggestions that why the error is coming inspite of making all the changes in the necessary files.
Is it hosting server error or database connection type error although I have made all the changes as per the requirement?

Kindly tell that how to make a registration system that work with php and MySql .
I tried the demo that is here http://youhack.me/2010/04/01/building-a-registration-system-with-email-verification-in-php/ but how it works with the online web hosting .
I have registered the free hosting at here http://www.freewebhostingarea.com/
I have also created the database at here but cannot know how to use php files and upload at http://www.freewebhostingarea.com/ and use the mysql database that I created here .
I want online registration system that uses php and mysql with the free hosting that serves my purpose.
The registration system creates the user and sends confirmation email to user’s email address and after confirmation user can log inn to the web application and further work will be done here after registration.
Kindly guide me in the above scenario or tell another free hosting service that fulfills my purpose.