In order to activate DistributeT.com.au you need to go under Settings -> Modules -> Domain Modules. Then, you have to click 'Activate' tab next to DistributeT.com.au module. To configure the activated module, you ought to go under Settings -> Apps -> Add New App. Once, DistributeT.com.au is added as a new app you will be asked for a new module configuration.
