I have a 2000 olds alero, how do i reset the

If you mean the change oil soon light............ Open the fuse panel; on the side of the dash by drivers door. turn on key but not far enough to start car.
Press the red reset button in the fuse panel until the oil light flashes , release the button and then press it again.
It has been a while since I have done this on an alero , so if you have your owners manual , it might be a good idea to read the instructions in there incase i have it wrong. By the way , the low tire pressure light works the same way.