Immediately to the left of your powder selection is a button with what appears to be a hand holding a pen.
Select that, and in the lower left hand corner of that box will appear another button with a "T", just above the "Apply&calc." button. That's the one you select and it will allow you to change temperature.
Pushing the top button also allows you to change the other parameters.
I apologize for the poor pictures, or rather my laziness. I didn't want to go through all the antics of circling the buttons...