[@robin-w Moderator 9 years, 1 month ago]

4 files of interest to you

all found in templates/default/bbpress

loop-search.php
loop-search-topic.php
loop-search-reply.php
loop-search-forum.php

copy them to your theme

so if you wanted to amend loop-search-topic 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-search-topic.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-search-topic.php
bbPress will now use this template instead of the original
and you can amend this