What you might be thinking of is resetting something specific, like:
* The trip odometer: This usually involves a button or sequence of button presses on the instrument cluster. Consult your owner's manual for the exact procedure.
* A malfunction indicator light (MIL) / Check Engine light: This light indicates a problem detected by the engine's control system. A flashing light usually means a serious problem requiring immediate attention. The light will not simply reset itself. You'll need to have the car diagnosed by a mechanic using an OBD-I scanner (for that year model) to find the problem and fix it. The light will then usually turn off automatically once the problem is solved and the car runs a certain number of cycles.
* Radio presets: This is usually done through buttons on the radio itself.
If you're having a specific problem with your car, describing the issue will help determine if there's a solution. For instance, if the engine isn't starting, it's not a computer reset that's needed; it's troubleshooting the starting system.
