How do you reset your abs and trac off light after abs unist are replaced?

It is more question than the answer. I have ABS light on all time and turn off light on also all time (talking about ther ABS brake system on Chevy impala 2001 ls 3.8.

I drive ok and brakes are ok. But light stays on makes me nervious all time. Someone said cut them to the hell! But I want to cut them off by right way: to understand why light on and how to stop the problem.

Pads are new? everything ok and there isn't any wrong in brakes working. Others say something here is dirty I need to clean for contacts. Other also say a unit ABS computer ar center.

No idea what reason !

Tell me please someone in order i can drive my car without being nerviuos on this reason all time thinking about that. Evern can't take a baby to the car she will say your brakes don't work we can't have the love on the hill tyou car can move from the hill itself to the river... Ha-ha-ha...