bbPress.org

Edit the file in wp-content/plugins/bbpress/includes/core

the file to edit is called capabilities.php

Incorrect; *never* edit any files in bbPress’s directory; you’ll lose those edits when software updates come in.

@anallabres – Research how WordPress’s actions/filters/plugins work. It’s a little dizzying at first, but a few lines of code can get you up and running.