[@robin-w Moderator 5 years, 7 months ago]

untested but this should do it

add_filter ('bbp_current_user_can_publish_topics' , 'rew_disallow_anon') ;

function rew_disallow_anon ($retval) {
	if ( ! is_user_logged_in() ) $retval=false ;
return $retval ;
}