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.
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!