Well you could get a refillable debit card if you don't have a normal debit or credit card, preferably a visa or mastercard but you can get a paypal one not sure if that one will work though, they sell them in Dollar General where I work and places like Walmart so easy to get, cost an activation fee then however much you want to put on the card. But after you have that click on his donation link at the top of this page, then look for; Don't have a PayPal account? Use your credit card or bank account (where available).
And click on the BLUE Continue and that will direct you to the page you need. It will ask for address, phone, and email, but I don't think they check those so you can put up whatever information if your scared of putting your personal information.