To the best of my knowledge if you look at the rear of the invoice sent, at the bottom it gives many cholces to pay, one is Bpay where it shows the biller code of 33589. If your bank details allow you to use Bay which in most cases is yes, then your good to go, if in doubt then talk to your bank.
So in reality you don't actually set it up, you just use the biller code and pay.
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Your BPAY biller code and reference number can vary based on several factors, such as your account number and which state you live in. To ensure that that you have the correct information to make these payments, we recommend that you get in touch with our web chat team here.