In Shopitag, go in the menu to Settings, go to salesprofile and select the icon 'payment settings'. Then choose 'I already have a payment provider'. From the list, choose Paypal. (in case Paypal does not show up in the list, please contact us, for some countries it is not available)
Now open a second tab in your browser, and go to paypal.com. Log in to Paypal, and look in the menu for 'Tools'. Then click 'business setup'.