Since Version 2.0 bbPress support so called Shortcodes. They have been introduced for creating macros to be used in the layout of your forum content on WordPress pages. To use any of the shortcodes simply insert the desired shortcode into any WordPress page.

To get the required numerical ID for $forum_id, $topic_id, $reply_id and $tag_id you will need to visit your /wp-admin/ section and either by editing the post or by hovering your mouse over the applicable forum/topic/reply/tag post type you will see a numeric ID for that post eg. /wp-admin/post.php?post=47