You will have to wait for your return to either be rejected or accepted. If rejected, then just log back in to your return, make the necessary corrections, and then refile it.
If your return gets accepted, then you will need to amend your return.
However, it will be best if you first wait to receive your
current refund before you amend (if you are due one). Please
note: A Form 1040X, Amended U.S. Individual Income Tax Return can take up to 16
weeks to process once the IRS receives it.
After you have received your refund, please read this
TurboTax FAQ about amending your 2018
tax return: How to amend
(change or correct) a return you already filed.