[@robkk Moderator 11 years, 2 months ago]

You can copy the form-topic.php into your theme/child theme into a folder called bbpress to customize the file used on your site.

Theme Compatibility

You can scroll all the way to the bottom of the file, and replace the current message

<div id="no-topic-<?php bbp_topic_id(); ?>" class="bbp-no-topic">
    <div class="bbp-template-notice">
        <p>You must be <a href="<?php echo site_url('/wp-login.php') ?>">logged in</a> or <a href="<?php echo site_url('/wp-login.php?action=register') ?>">registered</a> to create new topics.</p>
    </div>
</div>