bbPress.org

This is theme specific – we would need a link to a live example on your site please

try this

add_filter( 'get_the_archive_title', function ($title) {
 if ( is_category() ) {
 $title = single_cat_title( '', false );
 } elseif ( is_tag() ) {
 $title = single_tag_title( '', false );
 } elseif ( is_author() ) {
 $title = '<span class="vcard">' . get_the_author() . '</span>' ;
 }
 
 return $title;
});

Put this in your child theme’s function file –

ie wp-content/themes/%your-theme-name%/functions.php

where %your-theme-name% is the name of your theme

or use

Code Snippets

as I say it is theme specific, and if the above did not work, then it is beyond free help – sorry