On the Wordpress blog I am building, the consumer must join comment, once they register they're added like a customer with minimal permissions.

I'm wondering the way a add permissions for this user to allow them to only edit there own comments?

Cheers.

put the following code in function.php:

$subscriber= get_role('subscriber');
$subscriber->add_cap('edit_comment');

eidt_comment is just supported in verson 3.1 or more recent