how to reset Maintenace light 97

I just got a honda prelude 97. And i know there is away to reset the Maintenace light, someone told me forgot. I think it needs the master key, which i have. Please respond thanks

If you just want it to turn green again, stick your key in the slot at the bottom of the gauge cluster. granted, this doesnt fix anything but the light, i think it changes from green to amber every 7500 miles.