When you click on one of these buttons, you will be forwarded to Paypal.

You don't need a Paypal account to make an online payment, you can do so with just a credit or debit card.

On the Paypal webpage you see after hitting one of these buttons, first enter the amount you wish to pay and click the Update Total button.

Then, proceed with the Continue link by the credit card logos or by logging in to Paypal if you have an account.