Since your federal return has been accepted, the only way you can add a dependent is to file an amended return.
Your ORIGINAL 1040 can no longer be adjusted or changed.
You need to file an AMENDED return using Form 1040X
You should wait until your original return has processed before you file an amended return or the returns could cross each other and cause problems.
Log in to your account, open the tax return you already filed, and click on the link to amend your return.
Link for more information
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