Figure out pin address on MCU eval board (TI MSP432 Launchpad)
The TI MSP432 Launchpad uses the MSP432P401R and if you want to develop anything using it, you're going to want to reference the device specific data sheet and the device family data sheet. The data are not the easiest thing to read at first, but has all the information you need on this mirco. 

What you are looking for is the register that controls P6.0. You can find this register on page 500 of the device family data sheet where it talks about the  PxOUT Register and the PxDIR Register where x represents the port which in this case is port 6. You'll end up using the following lines to control that pin:

P6DIR =    0x01;  //sets P6.0 to output
P6OUT |=   0x01; //sets P6.0 to GPIO high
P6OUT &amp;= ~(0x01); //sets P6.0 to GPIO low