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

Press MORE then EDIT, use the up or down arrows to select your desired reminder interval in days, press DONE, then press RESET to start the timer. The filter reminder is controlled by system function 0500, and reminder intervals range from 10-day run time (about 1 month) up to 365-day run time (about 3 years). After replacing the filter, press RESET to restart the timer. (Page 43)