Please Help...Programming Assitance Needed with Dragon12

I am very new to programming/HC12 so please bare with me.  The code i
am currently dealing with is something my professor made available so
that i can modify it.  I am trying to run a heater using the Dragon 12
with a relay hooked up between the two.  I already have a thermistor
set up on the board with temperature being displayed to the LCD.  I am
wanting the heater to turn on when the temp is below 270 and turn off
when the temp is above 280.  I currently have the relay hooked up to
PB2 and ground.  This is where my programming knowledge ends.  I am
assuming it is just a matter of turning the relay either high or low
according to my previously mentioned criteria.  What i am wanting to
know is what i need to add to my Freescale CodeWarrior C code to cause
these things to happen.  If there is any other information you need,
let me know.  Thanks for your help.

-Bryan