NXROA OPTIONS, page-3

Also, you will need to get the form for option exercise off the ASX or the company and deliver it to the company with a cheque for payment. They normally put out an option exercise announcement about a month prior which contains the form + payment options the company accepts, however some coys don't do this, so I wouldn't rely on it.

if you have any questions, you can always ring the company and their secretary should answer your Q's