Data does not show, plz help

Hi

I am trying to add additional content on category pages and have added this code in my category.php but nothing shows

<?php if (function_exists('get_terms_meta')) { ?>
    <?php $metaValue = get_terms_meta(addthis); ?>
<?php
} ?>
<?php echo $metaValue; ?>

can you please guide if i have to add something else in functions file ir somewhere else

please help! Thanks

https://ww.wp.xz.cn/plugins/custom-taxonomy-category-and-term-fields/