in details.php find: "comment_user_profile_button" => $comment_user_profile_button,
Insert below: "comment_user_profile_link" => ($comment_user_id > GUEST) ? $comment_user_profile_link : REPLACE_EMPTY,
Then in comment_bit.html template you can use {if comment_user_profile_link}<a href="{comment_user_profile_link}">{endif comment_user_profile_link}{comment_user_name}{if comment_user_profile_link}</a>{endif comment_user_profile_link}