operating leds not on a dev board.

I see the examples of how to use the LEDS on the Keil examples but I'm not able to do this on my own board.

I tried something like
GPIOC->MODER |= (GPIO_MODER_MODER8_0);//output
GPIOC->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR8;//set max speed
GPIOC->OTYPER &= ~GPIO_OTYPER_OT_8;//push pull mode
GPIOC->PUPDR &= ~GPIO_PUPDR_PUPDR8 ;//disable pull up down.
GPIOC->BSRR = (1<<8);

then loop a
osDelay(200U); GPIOC->BSRR = (1<<8);
GPIOC->BSRR = (1<<24);
osDelay(200U);

but it is not bring the pin low. Is there an easier way to do this in vision?