When placing the order, at the invoice page, you can select Paypal as payment option. You will be taken automatically to the Paypal website to process your payment.
When payment for the renewal of an existing service, you will need to log in to your client area and go to the invoice section. You will be able to pay through Paypal from there.
Finally, if you still have issues, you can send your invoice number and request a Paypal payment link from our billing department (billing@sinohosting.net)