MSP-EXP430FR5969 controlling the BoosterPack connector pin P1.2 (or any BoosterPack connector pin)

The program pasted below blinks both the Green and Red LEDs (connected to P1.0 and P4.6 respectively) on MSP-EXP430FR5969 Launchpad.
But I intend to do one more thing - i.e. control P1.2 which is coming out as BoosterPack Connector Pin. When I use a multi-meter to measure the voltage, I see that it is always zero (I have ensured that I have sufficient delay like 3 to 5 seconds to change / blink LEDs).

How can I control P1.2 coming out as BoosterPack connector pin??

#include <msp430.h>

int main(void) {
    WDTCTL = WDTPW | WDTHOLD;               // Stop watchdog timer
    PM5CTL0 &= ~LOCKLPM5;                   // Disable the GPIO power-on default high-impedance mode
                                            // to activate previously configured port settings
    P1DIR |= 0x01;                          // Set P1.0 to output direction
    P4DIR |= 0b01000000;

    for(;;) {
        volatile unsigned int i;            // volatile to prevent optimization

        P1OUT ^= 0x05;                      // Toggle P1.0 and P1.2 using exclusive-OR
        P4OUT ^= 0x40;

        i = 50000;                          // SW Delay
        do i--;
        while(i != 0);
        i = 50000;                          // SW Delay
        do i--;
        while(i != 0);
        i = 50000;                          // SW Delay
        do i--;
        while(i != 0);
        i = 50000;                          // SW Delay
        do i--;
        while(i != 0);
        i = 50000;                          // SW Delay
        do i--;
        while(i != 0);
        i = 50000;                          // SW Delay
        do i--;
        while(i != 0);
        }
    return 0;
}