It would mean sending a check in the mail. Given that you're overseas, I suspect Paypal is a much better option, but if you prefer to send it via post, just pm me and I'll send you the address.
Thanks for thinking about donating!
Paypal has a horrible reputation in Germany and maybe in whole Europe. But I use Paypal to donate to HG myself and must say it works without any problems of any kind so far. I would recommend it for European zone players.