bbPress will tend to use the page.php template from your theme. You can modify the page.php template or create some custom templates that have layouts calls.
You can add a forum.php template to your theme for displaying the forum.
http://wp-types.com/documentation/user-guides/adding-layout-support-theme-templates/
You can use code something like this:
<?php get_header( 'layouts' ); ?> <?php if ( function_exists('the_ddlayout') ) : ?> <?php the_ddlayout( 'forum-layout' ); ?> <?php else: ?> <h1> <?php _e('This template requires the Drag and Drop Layout plugin.', 'wpbootstrap'); ?> </h1> <?php endif; ?> <?php get_footer( 'layouts' ); ?>
Best regards,
Bruce