he Havana theme includes one (1) Before Footer widget area that displays above the site footer when widgets are added to it.
Use of this widget area is optional and you can use it to display any content you wish. The theme demo uses the Genesis eNews extended widget to display an opt in form.
In the demo only the E-mail Field is active. If you also want to use the First Name Field and/or the Last Name Field you have to add some additional CSS. Add the CSS below to the Customizer Additional CSS field. Change the max-width to 26% if you use all the fields.