Hi,
You can edit the views/user/view.html.php and change the toolbar options:
$this->toolbar = array(
array('name' => 'link', 'icon' => 'upload', 'alt' => JText::_('JOOMLA_USER_OPTIONS'), 'url' => $url_link,'display'=>!empty($user->user_cms_id)),
array('name' => 'popup', 'icon' => 'send', 'alt' => JText::_('HIKA_EMAIL'), 'url' => $email_link,'display'=>!empty($user_id)),
'save',
'apply',
'cancel',
'|',
array('name' => 'pophelp', 'target' => $this->ctrl.'-form')
);
by removing the first line.
But this modification is not compatible with updates.
So the best solution in order to have a real compatibility with updates is to create a little plugin and plugged on the trigger onHikashopBeforeDisplayView.
I will see to implement a little function in order to let this modification easier to do.
Regards