Hi,
Please provide some more information about what you are doing. You mention controlling LEDs, but I'm unsure of much more than this. Are you using one of our TI EVMs like the MSP-EXP430F5529, or the MSP-EXP430G2 launchpad, or are you using your own custom board?
Typically to control an LED you only need to know which MSP430 pin it is connected to, and you can just set the pin as an output, and then set it high or low. You can find more information on how to do this by looking in the user's guide chapter on Digital I/O in the user's guide for the MSP430 that you are using.
Regards,
Katie