@piscitellij:
If you want to add some text, you can simply change the existing translations of the emails as explained here:
www.hikashop.com/en/download/languages.html#modify
If you want to add your logo to the email, you will have to edit the order creation/status notification email via the menu System->Emails (business edition) and add the HTML for your logo there. Without the Business edition, you can edit the files in media/com_hikashop/mail but you will loose your modifications when you update, unlike with the edition via the interface.
@juandress:
What fields ? What email ? I don't understand your question. Please give more information so that we can help you.