how to add module?

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.5
-- Error-message(debug-mod must be tuned on) -- : none

hi

how can i add a joomla module inside the filter.php file

i tried to add this code for the module but does not work

<jdoc:include type="modules" name="pos" style="xhtml" />

thanks