Adding sensors to thermostat controller

In Thermostat Controller 2.0, I’m having issues:

a) I am unable change a thermostat to “Free” from “Controlled”. When opening the app, the Centralite thermostat is shown as “Controlled”, but the whole line is greyed out and I cannot toggle the state.

b) I see no way to add a new temperature sensor to an existing controller. I sure hope that doesn’t mean I have to create ANOTHER controller that has all three sensors and then delete the existing one currently being used.

Help me, Mr./Ms. Wizard!