Re: Installing BBPress on a WordPress website.
You can’t install in such a way that ‘Forum’ will be automagically listed under your pages and appear in your WP theme.
However, you can install so that it uses the same user database. You can also add ‘Forum’, say, to your pages list and have it redirect to the actual forum (using a WP Page redirection plugin). You can also make the theme such on bb that it looks just like your wp theme, or use the wp header – trickier, but fairly well documented around here.