[@robin-w Moderator 12 years, 9 months ago]

If you want to create pages specifically to do things, then you can use shortcodes, the list of them is here

https://codex.bbpress.org/shortcodes/

so if you created a page and form instance put in the shortcode

[bbp-login]

you would have a page with a login.

Above the shortcode you could put some rules, or tell people how to register etc.