bbPress.org

Code goes into the file functions.php that you can find on Appearance – Editor – Function.php. Open the file and paste it at the end. Just be careful because depending the theme code it can work fine or break your wordpress (if it breaks the wp just remove the code using cpanel or ftp).

The code allow you to upload featured image for bbpress forums. Then you can give it css style for a better looking.

To do this you need administrator access.