HELP!!! How to add LEAVE FEEDBACK on listing page?

I want to add the option user to leave feedback from listing page (not only when job is done).
I’ve tried to add this code which I found on my Classifieds theme but it doesn’t work:

<?php if(isset($GLOBALS[‘CORE_THEME’][‘feedback_enable’]) && $GLOBALS[‘CORE_THEME’][‘feedback_enable’] == ‘1’ && $userdata->ID != $post->post_author){ ?>

<i class=”fa fa-comment”></i> [FEEDBACK]

<?php } ?>

I also tried to use the [TOOLBOX show=’feedfack’] and it doesn’t display anything. Any ideas?

I can’t use the order form because PayPal doesn’t accept payments in my currency. That’s why I need to make some shortcut to the leave feedback form. Please help!