Hi,
To integrate ViArt Shop for your Paypal Account you are to make the necessary settings in the Paypal Payment System. For this go to Administration > Orders > Payment Systems, find PayPal System and click the 'Edit Link'. Please, read the Installation Notes carefully as they contain basic information on how to setup your paypal system. We would also recommend to refer to this article from our manual to get more detail information on setting the payment system:
http://www.viart.com/general_payment_system_settings_for_php_shopping_cart.html
If you face any specific problems, please contact our support team.
With regards,
ViArt Support Team