[@macpresss Participant 13 years, 12 months ago]

First you don’t need to create a new page.

When you install -/activate bbPress you get the slugs forums and topics by default look at the settings.

When you type just forums behind your url (as it would be a page) you go straight to the forums index page.
And if you would like to edit the layout of the page you should copy the archive-forums.php file from the plugins folder to your theme folder and make some changes.