How bbpres work ?

Hi, i'm trying to install bbpress on Edublogs theme, and there is something i don't understand, i think.
How do you install it ?
If i create a forums page nothing appears, if i add [bbp-forum-index] on this page i have a blank page.
If i don't create page and create only forum i have a 404 page, if i add [bbp-forum-index] to this forum it works but on index forum i see [bbp-forum-index] shortcode....

I don't see how to make it work.