try the following:
1. In your themes folder create a new folder called “bbpress”
2. Then go to: ../wp-content/plugins/bbpress/templates/default/extras
3. Copy all these files into the folder you created in step one.
4. Edit the files in ../wp-content/themes/marketica/bbpress:
Every file in there has the line (close to the bottom):
<?php get_sidebar(); ?>
Change this to:
<?php /*get_sidebar();*/ ?>
This should completely hide the sidebar. Otherwise maybe contact the author of the theme. Maybe the theme already contains forum template which may overwrite the bbpress originals.
Hope I could help!
I am using the plugin from http://www.gdbbpbox.com.
With this you can completely change the content of the notification. It’s not free but well worth it!
It offers tons of options to enhance bbpress functionality.