app/views/spree/admin/orders/_admin_pos_config.html.erb
<div class="panel panel-default pos">
<div class='panel-heading center'>Pos Settings</div>
<div class='panel-body'>
<label>Pos Shipping Method</label>
<%= select_tag :pos_shipping, options_from_collection_for_select(Spree::ShippingMethod.all, :name, :name, SpreePos::Config[:pos_shipping]), :class => 'fullwidth' %>
</div>
</div>