[pekmez]

the path is just like for the version 2.4.1

wp-content/plugins/bbpress/templates/default/bbpress/loop-single-forum.php

As JarretC wrote before

Change the line 30

<?php bbp_list_forums(); ?>

to

<?php bbp_list_forums( array ( 'separator' => '<br />' ) ); ?>

Thanx JarretC

[pekmez]

as garindan post, pls try this file to edit.

wp-content/plugins/bbpress/includes/common/template.php

Line 2249

change

// Add the breadcrumb
// $crumbs[] = '<a href="' . esc_url( $root_url ) . '">' . $r['root_text'] . '</a>';

to this

// Add the breadcrumb
// $crumbs[] = '<a href="' . esc_url( $root_url ) . '">' . $r['root_text'] . '</a>';
$crumbs[] = '<a href="/forum/">Forum</a>';