Form Builder
The Add Form page
With the Form Builder module installed and enabled, the Add Form page provided by the Core script (by default found in the "Add Form" link in the left navigation) contains a new "Form Builder" panel, as shown in the screenshot to the right.
After selecting the Form Builder option, you will be redirected to a second page where you specify a few details about your form (form name, number of fields and permissions).
All of these settings can be changed later - you're never boxed in by any choice you make. If you need to add or remove fields, rename the form or change the permissions, this can all be done at a later date.