You can make a single one-off donations or may opt to make regular repeating payments, if you would prefer to spread your payments out over a longer period, or would like your giving to continuing into the future. You can cancel a regular payment arrangement at any time.
If you are a UK tax-payer, you can increase the value of your gift to the Trust by 20% by completing the Gift Aid declaration that Paypal will send you when acknowledging your payment.