You can pay for your domain name registration and renewals here.
Just select the appropriate button below and renew your domain. Payments are made with Paypal, and you do not have to have a Paypal account, you can just use your credit card.
.com.au domain name renewals $66.00 (2 years) [wp_cart:.com.au-renewal:price:66.00:shipping:00.00:end]
.com or .net domain name renewals $44.00 (2 years) [wp_cart:.com-renewal:price:44.00:shipping:00.00:end]