you can still call loop single reply, but just amend that template and put it into in your theme.
so if you wanted to amend loop-single-reply 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-reply.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-reply.php
bbPress will now use this template instead of the original
and you can amend this
