The best way to contact us is via email at Support@Zend.To.
All donations should be sent by Paypal. If you need to pay by cheque or check then make it out to "J.K.Field". If you need an invoice then do ask. I always welcome surprise gifts; either something relevant to your part of the world, or else from my Amazon wish list!
Send your donations to
Electronics and Computer Science
University of Southampton
If you have a question about ZendTo or its use, please first trycontact me directly and I will help you out where possible. I try to respond to every email you send me. Don't expect much if I think you have clearly not looked at all the documentation above!