extract the zip file .. upload the extracted bbpress folder to the root of your websites location. Example: your website is located at http://www.hermiony.com, it will look like this http://www.hermiony.com/bbpress. You can, if you want, rename the bbpress folder to forums or something else. Go to http://www.hermiony.com/bbpress with you browser and the installer will guide you furter. Good luck…
Doesnt latest bbpress require wp 2.5 ?
didnt the installer post you your password ?
maybe reinstall ?