How do you reset the check oil light after an oil change?

What do you mean by check oil light? If the oil light is on it means the oil pressure is low and stop the engine immediately and check the oil level. Now if you are referring to the maintenance required light then without the make, model, & year of the vehicle I cannot answer your question. All I can say is read you owners manual. On most newer GM cars and trucks you turn the key on and push the gas pedal to the floor 3 times, turn off.