Adding more fields to the form
After the form is created, if you want to add more fields to the form via the Form Designer, you can access this section by going to
ACP -> MODULES -> FORMS -> SIMPLE CUSTOM FORMS -> TOOLS -> CUSTOM FORM BROWSER
Then click on the 'Name' of the form to view the form in its location, from there you can click on the Form Designer
button to get back to the Form Designer.