Re: Warning: fopen fwrite Permission denied errors
The first error is the important one: the software cannot write to bb-config.php. That could be because the file has the wrong permissions (should be 644 and writable by the web server) or it could be something to do with the one forward slash there in the path (right between bbpress and bb-config.php).
A workaround might be to manually edit the bb-config.php and then upload that. Then the installer won’t have to write to that file. Just open bb-config-sample.php and edit all the database values, keys, table prefix and language if you use one. Then, save the bb-config-sample.php as bb-config.php and run the web installer again. It should tell you it found a valid bb-config.php and you can continue. If not, post errors back here.