Go to Dashboard > Design Dashboard > Form.
Open any existing form from the Form Module list to add, remove, or reorder fields, or to change which email address receives submissions.
Every submission is saved in your dashboard against the form, so you always have a backup record even if the notification email is missed or deleted.
Once built, a form still needs to be placed on a web page before customers can see it. See the Adding Forms to a webpage article for that step.