I am quite new to CMS MAde Simple. I am not able to understand how the data can be saved to database. I think its in smarty framework.
Storing form data in your database is actually a built-in feature of the FormBuilder module. To do this add a new field to your form, and choose "*Store Results In Database" as the type of field. Data will be stored in an XML format in the [PREFIX]_module_fb_formbrowser database table.