Application_Form/app/views/admin/application_forms/edit.html.erb

<%= form_for @application_form, url: admin_application_form_path(@application_form), html: {class: "form-horizontal main-forms"} do |f| %>
  <fieldset>
    <%= render :partial => 'form', locals: {f: f} %>
  </fieldset>
<% end %>