If you would like to purchase a new domain name you can do so at any time from the My Account area.
Simply visit https://www.suncoasthosting.com.au/system/ and then enter the domain name you would like to register.
Once your domain is registered you will need to add the new domain name as a parked or addon domain in your control panel. You can access your control panel by visiting https://www.suncoasthosting.com.au/system/login, logging in, select your hosting service and selecting 'Parked Domains' from the 'Domains' menu.