app/views/users/preferences.html.erb
<h3><%= t('users.preferences.title') %></h3>
<%= simple_form_for(current_user, url: preferences_user_path(current_user), html: { class: 'form-horizontal block-form' }, wrapper: :horizontal_form) do |f| %>
<div class="form-group">
<div class="col-sm-offset-3 col-sm-9">
<%= f.button :submit %>
</div>
</div>
<% end %>