hmm
you’ll need to alter several files, so general first
altering bbpress templates
You can copy all the templates across, but you only need to copy those that you want to change, and it is better just to do this, as then you know which you have altered.
so if you wanted to amend loop-single-forum you would do the following
create a directory on your theme called ‘bbpress’
ie wp-content/themes/%your-theme-name%/bbpress
where %your-theme-name% is the name of your theme
find
wp-content/plugins/bbpress/templates/default/bbpress/loop-single-forum.php
Make a copy of this file, and put in in the directory called bbpress that you created above, so you end up with
wp-content/themes/%your-theme-name%/bbpress/loop-single-forum.php
bbPress will now use this template instead of the original
and you can amend this
files
There may be others, but
loop-forums (forum headings)
loop-single forum (forum content)
loop-topics (single forum heading)
loop-single-topic (single forum content)
will get you most of the way there