If you already filed your return then you can't change the information on it. You have to file an amended return.
Before you file an amended return you will have to wait for the IRS to process the original return. Often, when the mistake is obvious, the IRS will fix your return for you and you don't have to do anything. You will just receive a refund that is a different amount than you originally expected as well as a letter explaining what the IRS changed on your return.
Either way, wait until you receive your refund and your return has been processed to amend your return. The amendment form isn't ready yet anyway (that's why it won't let you do it).
@ELDERONE1
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