First, the device number shows up during the initial startup menu and recommends the number be written down. Secondly, it can always be accessed afterwards on the device itself.
Programming
You can opt into using the air probe instead of the floor probe if you are more concerned about trying to achieve a specific air temperature, usually for primary heat.
Go to Profile > Select the cog for the location > Scroll down and select Edit Location.
If you have set the floor type to any kind of floating floor, a safety feature in the thermostat will not allow you to increase the target temperature any higher than 81 degrees. Click “Read More” for details.