If you were not eligible to receive a stimulus payment based on your 2020 tax return the page in the Federal Review section of the program would not have been displayed.
If you were eligible then you just skipped over the page. Now you have to wait for the IRS to accept or reject your tax return. If rejected you can complete the stimulus page and e-file again.
If accepted you will have to wait for the IRS to finish processing your tax return before it can be amended.