OK so it looks like Rich already set everything up. The dif was 1 and it was set to heat and so on.

My only remaining question is this:

I have the JC probe and my Acurite probe in the same spot. There is a ~5 degree difference between the readings. The JC says it's 89 while the Accurite is 84.6. I suppose perhaps the Accurite is wrong because I ahve had it for a while?