For information on how to install & use bbPress, check out these help documents
From your WordPress Administration Panel:
bbPress will now be compatible with the PageLines Framework.
It is recommended you read through the bbPress documentation.
Also you can customize the layout of your bbPress forum by going to Wordpress Admin Dashboard > PageLines > Meta and you should have a 4 bbPress templates to customize.
Further customization of your bbPress site should be accomplished using CSS.
We recommend you take a look at How to Add Customization for more information.