bbPress.org

The following should do it – put this in your functions file

function bbp_website_information () 
//This function adds the website to the avatar display of topics/replies
{
	echo '<li>' ; 
	$user_id = bbp_get_reply_author_id( $reply_id );
	global $wpdb;
	$url = get_userdata($user_id) ;
	$url=$url->user_url ;
	$url='<a href="'.$url.'">'.$url.'</a>';
	echo $url ;
	echo '</li>' ;
}
		
add_action ('bbp_theme_after_reply_author_details', 'bbp_website_information') ;