If you have filed your tax return and then discover that you have to delete a dependent you will have to wait until the IRS either accepts or rejects your tax return.
Because your return was rejected you will correct the error that caused the rejection (your dependent) by removing the dependent and then refile your return.
If the return was accepted by the IRS then you will have to file an amended tax return using Form 1040X to remove the dependent and then file your tax return.
This link to the TurboTax Help page How to amend (change or correct) a return you already filed provides information on how to amend your tax return.
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