How do I register my thermostat for remote access through Total Connect Comfort?

Go to mytotalconnectcomfort.com and create an account or log in, then follow the on-screen instructions to register your thermostat by entering its unique MAC ID and MAC CRC codes. These IDs are found on the Thermostat ID Card included in the package or on the back of the thermostat when removed from the wallplate. Check your email for an activation message and follow the activation instructions before logging in. (Pages 31-34)

From the official Honeywell RTH6580WF Wi-Fi Smart Thermostat manual, page 33

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