I need help in regards to the new addition to the child tax credit that was increased on Saturday. I already filed. How do I get that? Calling TT was not helpful.

When I called TurboTax and got someone he put me on hold and then sent an automated message for people who are self-employed, which I am not. It’s very frustrating to Wait for a callback for 20 minutes on my lunch break only to get misinformation. Can someone please tell me How to increase and the child tax credit passed on Saturday can be obtained for those of us who have already filed? Will it be sent automatically or do I need to amend my tax return? And if so what form do I use and how do I do it? Thank you!