Hi,
The "generate" button can only work if you save the configuration with the generator you want to use. So it should be done in two steps.
When you click on "generate" it uses the generator in the actual saved configuration.
When you submit the "generate" page, you should stay in the same page with a notice message saying "XX serials generated with success". (where XX is the number of serials you asked).
If you want to generate coupons with the coupon generator you should have a coupon template without any product needed (no variable price, just fixed price).
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.