Hello,
Note that this is an English support forum .
1. I didn't really understood your question but if you have some issue with your customer registration the solution will be to change the way you configured the page "Hikashop->System->Configuration->Checkout".
2. If you don't get an email, check your spam box. If you don't have it, check that you can send emails with Joomla (from the mass mail component for example). If you don't receive the emails, it's likely that the email configuration of the joomla configuration page is not correct. You should ask your hosting company about what you should put there.
If your customers receive them and not the administrator, it's likely that the email configuration of the hikashop configuration page is not correct. You should ask your hosting company about what you should put there. Usually, it comes from either the charset encoding, or the "add names" option.