Hello,
1. You can hide your account type manually via code: ftp > includes > controllers > registration.inc.php
find a code:
PHP Code:
Only registered members can view the code.
add a key of your account type after 'visitor' like this:
...getAccountTypes( array('visitor', 'account_type_key') );
2. to control account boxes by its type go to templates > your template > tpl > blocks > listing_details_seller.tpl
wrap content which you need to hide for your account type with this code:
Code:
Only registered members can view the code.