With the ignition in the ACC position, Press and hold down the button marked FM/AM (on the left of the radio under the volume knob). Now while holding that button down press the #1 preset button on the right of the radio. That's the hour button. Once the hour is set, press the #2 preset button the change the minutes.

If you want to have the clock display while the radio or cd plays, press the FM/AM button then press and hold down the #4 preset button until it beeps (about 4-6 seconds). Normally the radio station or cd info shows all the time but now the clock will display after about 10 seconds.. To change back do the same procedure.