How do I set up the Room ID during initial thermostat installation?

During Initialization Mode, press MODE when 'rId' is displayed. The default Room ID (65535) will scroll across the screen. Use UP/DOWN arrow buttons to set three values: the highest digit (range 0-6), then two middle digits (range 0-99), and finally the lowest two digits (range 0-99), pressing FAN between each field. Press MODE to accept the complete value and proceed to HVAC setup. (Page 15)