xmasbaby0 is right about what to do if you haven't clicked the button. If you really did click the button, hopefully there were other things missing and the return rejected so you can fix it. Otherwise, you will need to wait for the IRS to accept the return and then file an amended return. You can e-file the amended.
If you have a state return that was submitted, you will need to amend the state as well.
See:
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