UPDATE! The PayPal link is all set, now. Sorry for the inconvenience!
Looks like there’s some trouble with the “Donate” button over there on the right. We’re looking into it and we intend to have it fixed ASAP.
In the meantime, please click it to head over to PayPal. Above the “Sorry…” message, choose “Send Money Online” from the “Send Money” menu. In the form, enter the email associated with your PayPal account in the “From” field and the email “firstname.lastname@example.org” in the “To” field. Then enter the amount you’ve chosen.
Sorry for the trouble. Thanks so much for your contribution!