app/views/admin/merchandise/prototypes/edit.html.erb
<%= render partial: '/admin/merchandise/sub_header'%>
<h3>Editing Prototype <%= @prototype.name %></h3>
<%= form_for @prototype, url: admin_merchandise_prototype_path(@prototype) do |form| %>
<%= render partial: '/admin/merchandise/prototypes/form', locals: { form: form } %>
<%= submit_tag "Update", class: "button" %>
<% end %>