bbPress

• If your bbPress version is 1.0.2 or lower, open bb-post.php and switch lines 46 and 48. They must look like this:

$topic = get_topic( $topic_id, false );

$link = get_post_link( $post_id );

• Copy plugin folder into my-plugins folder.

• Activate the plugin and go to plugin configuration page at Plugins > Nicer Permalinks.

• Check prerequisites and enable the plugin.