I setup my 3 Redlink thermostats. 2: VisionPRO 8000 and 1 ComfortNet CTK03 (Its a Honeywell IAQ prestige 2.0 with a interface to communicate with my central AC)
Marketplace->Climate Control->Thermostats->Honeywell->VisionPro WiFi-> Connect Now-> Log In.
One you login using your Total Connect Comfort credentials, your Redlink connected thermostats will be listed. You can select them and connect them to your hub.
I had to disconnect two of mine from the WeatherBug Home app.