Notice: this module is deprecated and no longer supported by HostBill
In order to activate Subreg.cz you need to go under Settings -> Modules -> Domain Modules. Then, you have to click 'Activate' tab next to Subreg.cz module. To configure the activated module, you need to go under Settings -> Apps -> Add New App. Once Subreg.cz is added as a new app you will be asked for a new module configuration.