The ACF's recently appointed Olympiad Appeal coordinator Ian Murray has launched a website for the purpose. Thankfully, there is possibility for fans to donate online via PayPal. Of course if you prefer the old fashioned method, then that's available too.
I must add that I do like that photo album on the appeal website. Great idea. It has shots of the Aussies from various Olympiads over the years. The first photo you'll see is of the now GM-elect Zong Yuan Zhao in what appears to be deep meditation. Perhaps that's the secret of his success?