For the forum list in your sidebar, check the widget: https://codex.bbpress.org/features/widgets/
To edit the ‘index forum page’, create a standard WordPress page and change the slug to ‘forums’. This new page will then be used in stead of the standard list. You can then of course use the [bbp-forum-index] shortcode to display the list of forums.
Pascal.
Thank you, and how can I edit the content of this bbp-forum-index?
What exactly do you want to edit ?
That shortcode will show you the index table. If you want to change something in it, have a look at https://codex.bbpress.org/layout-and-functionality-examples-you-can-use/ if you find what you want to change.
Pascal.
I want to delete this function.
https://codex.bbpress.org/layout-and-functionality-examples-you-can-use/#21-show-5-recent-topics-after-forum-index
How can I make this?
And how can I put into the Forumlist widget all forums with subforums?