In the CSSS Form Builder wizard, the Form Function tab allows you to configure the form data to be sent using an email.
if you would rather store the form data in a database, you would need to add an insert record behavior to the page for this, you can use the dreamweaver insert behavior, or use data assist.
i guess the answer to your question "where goes the form once I pushed on submit button" is a question back:
Where do you want it to go?
Form Builder is a tool for creating the form, how you collect the data that is entered is up to you.