You should answer NO. Then enter the amount you received for the second stimulus and leave the 0 for the first stimulus.
The second stimulus payment received in 2021 is reported on the 2020 federal tax return.
Yes. Enter the 2nd round. The screen even says it was Dec 2020 to Feb 2021. Be sure to enter the correct amount you actually got in the right box. If you didn't get one enter 0 in the box. Then before you file make sure 1040 line 30 is right and only for the amount you didn't get.