How do I set up a filter change reminder on the thermostat?

Go to Installer Setup Number 0500 in the Advanced Settings Menu and select an option from 1 to 6 to enable the furnace filter change reminder. The options range from 10 run-time days (option 1) up to 365 run-time days (option 6), with run time based on calls for the fan. The factory default setting is 0, which means the reminder is off. (Page 16)