It should be in your owners manual. This is from my 2001 SLK230 owners manual:

1. Turn key in steering lock to position 2

2. Within 4 seconds press button (1) twice, this is the button to the left of the speedometer.

3. The present status for days or distance is displayed. Within 10 seconds turn key in steering lock to position 0.

4. Press and hold button (1), while turning key to position 2 again. The present status for days or distance is displayed once more. Continue to hold button (1).

After approx. 10 seconds a signal sounds, and the display shows 10,000 miles (Canada: 15,000 km) for approx. 10 seconds.

5. Release button (1).

*NOTE* Some people have problems resetting their FSS, you have to follow the intructions exactly for the FSS to reset.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible