Hold Select and Mode, then the timer settings will appear, and you use the up and down arrows on the key pad to move the time, then you select mode to change the off time to the on time. We like 8 and 2 for overall use, and 7 and 3 in summer. The winter will work fine on 9 and 1. Press Select once you have programmed the times. The PDF of the manual will also help you on more things in the future, and you should copy it. BCB