BuddyPress.org

I recently installed ‘sitewide forums’ on my buddypress website under development.
I have been trying to find a way to install a different theme for this sitewide forum but cant find anything.
At all places it is mentioned that when you go to your bbpress forum, you will see an ‘Admin’ link, click on it and then you will be able to change the theme. But I cant see any ‘Admin’ link when I visit the forums and there is also no option to select a different theme for forum in the forums setting page:

http://mysite/wp-admin/options-general.php?page=bbpress

Is the sitewide forum installed through buddypress different then the bbpress installation? Are we supposed to see the admin link here too? Is there a way to change the theme for the forums?

Please help!