Hello,
How can we make ads reporting be available only to registered users? Moreover I would like to be able to add also a small text describing the issue.
Running on latest version of osclass with zeta theme.

You mean "mark as ..."?
That is not possible right now. In future updates we plan to redesign this feature.

I made it only work for logged in users, here is my code, I can't add it here because it says it contains external links but it doesn't:

pastecode.io/s/12a8dfbo

It's not sufficient solution, spam bots already know links so hiding them will not help you.

Here is your code:
<?php if (osc_is_web_user_logged_in()) : ?>
  <div class="report-wrap" style="display:none;">
    <div class="head"><?php _e('Report listing', 'zeta'); ?></div>
    <div class="wrap">
      <div class="line"><?php _e('If you find this listing as inappropriate, offensive, or spammy, please let us know about it.', 'zeta'); ?></div>
      <div class="line"><strong><?php _e('Select one of the following reasons:', 'zeta'); ?></strong></div>
     
      <div class="text">
        <a href="<?php echo osc_item_link_spam(); ?>" rel="nofollow" class="btn btn-white"><?php _e('Spam', 'zeta'); ?></a>
        <a href="<?php echo osc_item_link_bad_category(); ?>" rel="nofollow" class="btn btn-white"><?php _e('Misclassified', 'zeta'); ?></a>
        <a href="<?php echo osc_item_link_repeated(); ?>" rel="nofollow" class="btn btn-white"><?php _e('Duplicated', 'zeta'); ?></a>
        <a href="<?php echo osc_item_link_expired(); ?>" rel="nofollow" class="btn btn-white"><?php _e('Expired', 'zeta'); ?></a>
        <a href="<?php echo osc_item_link_offensive(); ?>" rel="nofollow" class="btn btn-white"><?php _e('Offensive', 'zeta'); ?></a>
      </div>
     
      <div class="line center"><?php _e('Thanks for helping us!', 'zeta'); ?></div>
    </div>
  </div>
<?php else : ?>
  <div class="report-wrap" style="display:none;">
    <div class="head"><?php _e('Report listing', 'zeta'); ?></div>
    <div class="wrap">
      <div class="line"><?php _e('Please log in to report this listing.', 'zeta'); ?></div>
      <div class="text center">
        <a href="<?php echo osc_user_login_url(); ?>" class="btn btn-primary"><?php _e('Login', 'zeta'); ?></a>
      </div>
    </div>
  </div>
<?php endif; ?>

<script>
document.querySelector('.report-button').addEventListener('click', function(e) {
    e.preventDefault();
    document.querySelector('.report-wrap').classList.toggle('visible');
});

  document.addEventListener("DOMContentLoaded", function() {
  document.querySelector('.report-wrap').style.display = 'none';
});
</script>

If you go to controller/item.php,
find:
      case 'mark':

and below add:
if(!osc_is_web_user_logged_in()) {
  return false;
}

If you go to controller/item.php,
find:

Code: [Select]

      case 'mark':

and below add:

Code: [Select]

if(!osc_is_web_user_logged_in()) {
  return false;
}

Thanks!