Replacing Braeburn 5200 with Totaline Thermostat

Replacing Braeburn 5200 with Totaline Thermostat

I bought a Totaline RF remote thermostat. My old Braeburn 5200 programmable the black wire was landed on the "E" terminal and the orange wire on the "O" terminal. The new Totaline has one terminal that states O/B. What do I do with the orange wire and the black wire? What I have is an electric air handler with electric heat and not a heat pump. I. So far I managed to connect the white, yellow, common (cyan), green, and red in what appear to be the right places.