Hosting Australia recommends enabling Auto Renew on all your domains, to avoid any issues.  Disabling auto renewal, will mean the entire renewal process is manual.

If you have made the choice to disable auto renewal, please follow the below steps to manually renew your domain:

1. Login to the Hosting Australia Client area, via clients.hosting-australia.com.
2. Click on DOMAINS from the Client Menu, and choose RENEW.
3. You will see a list of all domains that are currently eligible for renewal. Tick the box next to the domain(s) you wish to renew and choose the renewal period.
4. Click ORDER NOW
5. Follow normal check out steps to pay the invoice.

More information regarding domains can be found here.