B96b-f446ve - ADC2 & ADC3

The STM32F446VET6 has 3 ADCs. The “PeripheralNames.h” file shows all three ADCs declared
typedef enum {
ADC_1 = (int)ADC1_BASE,
ADC_2 = (int)ADC2_BASE,
ADC_3 = (int)ADC3_BASE
} ADCName;

However, the port pins have been assigned only for the ADC1. How do I use the ADC2 and ADC3?