I need to erase or stop my tax return that i registered today, it was accepted but i accidentally claimed my dependent when someone else claims him, how can i do this?

I didn't get the 600 for dependent from 2nd stimulus check, so i filed my return (even though i dont usually file) to get the 600 but later realized that my dad claims my son and i can go the non filers form on irs site to do this. So i need to delete my return that was accepted today