There isn’t any Good Tutorial available to install a new Theme in bbpress 2.X.
However, I found its much easier to customize the default theme other than installing a new one. The structure of the default theme is good to use, but somehow I needed to include its stylesheet into my site’s main style.css file because it was picking all styles from my website’s stylesheet and there was no structure and layout formatting at all.
Here is a quick and easy way to customize the default theme and apply it:
1. Copy “bbpress” folder from wp-content/plugins/bbpress/templates/default into your websites theme root folder.
2. Create a folder called “css” (if you dont have one) into your website’s theme folder and copy bbpress css file from wp-content/plugins/bbpress/templates/default/css/bbpress.css to this folder.
3.Open your themes style.css and include bbpress.css file. (@import url(“css/bbpress.css”).
4. You can start customizing bbpress.css and now you will see the default sturcture of bbpress theme.
Hope that helps.
Thanks,
Shah