Re: plugin and limited memory bbpress
No, it’s a known issue with WP and php memory, so I’m not surprised to see it crop up with bb as well.
Read here:
http://www.narfstuff.co.uk/2008/03/14/php-memory-and-wordpress/
But seeing as you don’t know how to do that now, I suspect you’ll need to talk to your webhost for help. If you have a good host, they’ll help you out