Looks like there is a missing settings for this. Temporarily, edit the file /components/com_easyblog/themes/wireframe/comments/form.php and change the codes below,
<?php if ($this->config->get('comment_tnc') && (($this->config->get('comment_tnc_users') == 0 && $this->my->guest) || ($this->config->get('comment_tnc_users') == 1 && !$this->my->guest) || ($this->config->get('comment_tnc_users') == 2))) { ?>
<div class="eb-checkbox">
<input type="checkbox" name="tnc" id="tnc" value="1" data-comment-terms/>
<label for="tnc">
<?php echo JText::sprintf('COM_EASYBLOG_COMMENTS_TNC_AGREE', '<a href="javascript:void(0);" data-comment-tnc>' . JText::_('COM_EASYBLOG_COMMENTS_TNC_TEXT') . '</a>'); ?>
</label>
</div>
<?php } ?>
With,
<div class="eb-checkbox">
<input type="checkbox" name="tnc" id="tnc" value="1" data-comment-terms/>
<label for="tnc">
<?php echo JText::sprintf('COM_EASYBLOG_COMMENTS_TNC_AGREE', '<a href="javascript:void(0);" data-comment-tnc>' . JText::_('COM_EASYBLOG_COMMENTS_TNC_TEXT') . '</a>'); ?>
</label>
</div>