Engine light came on after pumping gas found out gas cap wasn't on tight how to get engine light off

What is your question?

Pulled over then I turn car off and Found out the gas cap wasn't on tight. How do I get the engine light off?

What makes this problem better or worse?

Car still perform good just the gas cap wasn’t tighten

How long has your 2013 Mercedes-Benz S550 had this problem?

Couple of hours