All modules of this plugin are disabled defaultly. So you should enable some modules first as your needs. How to enable modules as the following described.
Enable/Disable Discount Module
Note
Discount module requries WooCommerce , so you should install and active WooCommerce Plugin before enable discount module.
To enable discount module, you should select Bzhy -> Dashboard from the WP management page,as below shown:

To enable/disable a module, you just should turn on/off the slider of the module.