Hi,
To use a generator, you first have to create a generator configuration.
In the HikaSerial plugins, you have to select the generator you want to use and create a new configuration into.
It is the same logic than the shipping/payment configuration in HikaShop 2.2.x and newer.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.