By default, bbPress is changing all external links in the content to include rel attribute set to ‘nofollow’.
bbPress doesn’t have any settings for this, but this can be achieved using custom code or the plugin.
Custom Code
Just include this code in your theme functions.php:
// disable adding 'nofollow' for topics
remove_filter('bbp_get_topic_content', 'bbp_rel_nofollow', 50);
// disable adding 'nofollow' for replies
remove_filter('bbp_get_reply_content', 'bbp_rel_nofollow', 50);
Using a plugin
If you don’t want to add custom code, you might wanna consider one of the plugins that can do this:
