<%= simple_form_for [forem, :admin, @forum] do |f| %>
  <%= f.association :category, :include_blank => false %>
  <%= f.input :title %>
  <%= f.input :description, :as => :text %>

  <h3>Moderator Groups</h3>
  <%= f.association :moderators, :as => :check_boxes %>
  <%= f.submit %>
<% end %>

<%= simple_form_for [forem, :admin, @forum] do |f| %>
  <%= f.association :category, :include_blank => false %>
  <%= f.input :title %>
  <%= f.input :description, :as => :text %>

  <h3>Private for</h3>
  <%= f.association :allowed_viewers, :as => :check_boxes %>

  <h3>Moderator Groups</h3>
  <%= f.association :moderators, :as => :check_boxes %>
  <%= f.submit %>
<% end %>

Add 'private for' option in forum creation view
Add 'private for' option in forum creation view
