<script>
(function($) {
    $(document).ready(function() {
        if ($('body').hasClass('single-post')) {
            var post_meta = $('.et_post_meta_wrapper .post-meta'),
                insert_after = $('.entry-content p:first-child');
            post_meta.detach();
            post_meta.insertAfter(insert_after);
            console.log('test');
        }
    });
})(jQuery);
</script>