bbPress.org

It is part of your set of editable templates from bbPress. Like I said copy the file into a child theme in a folder called bbpress.

The directory “wp-content/plugins/bbpress/templates/default/” contains the directories “bbpress”, “css”, “extras”, and “js”, and the file “bbpress-functions.php”.

The “bbpress” directory contains template parts. Copy any of them into a directory named “bbpress” in your themes root, so it looks like: /wp-content/themes/%your-theme%/bbpress/

Theme Compatibility