Hi there,
Just edit the view listing of order in the backend (Display>Views) and add the code here (before the last </td>):
<td class="hikashop_order_customer_value">
<?php
if(!empty($row->username)){
echo $row->name.' ( '.$row->username.' )</a><br/>';
}
$url = hikashop_completeLink('user&task=edit&cid[]='.$row->user_id);
$config =& hikashop_config();
if(hikashop_isAllowed($config->get('acl_user_manage','all'))) echo $row->user_email.'<a href="'.$url.$target.'"><img src="'.HIKASHOP_IMAGES.'edit2.png" alt="edit"/></a>';
?>
</td>