bbPress.org

That plugin was written by _ck_ – she’s stated that she’s not going to update her plugins until bbPress 1.0 has had a chance to settle down… around December or so:

https://bbpress.org/forums/topic/bbcode-buttons-and-bbpress-smilies-not-working-for-me

If you’re in any sort of hurry to use her plugins, your best bet is to use bbPress 0.9.