If you filed, it is like dropping it into a mailbox - you cannot get it back.
You'll have wait until your return is either accepted or rejected.
- If rejected, you can make any necessary changes.
- If accepted, you'll need to amend your return.
- To avoid unnecessary delays, do not amend until your original return has been fully processed. You will need to print and mail the amendment.
- Allow 8-12 weeks for processing.
See this TurboTax FAQ for help with amending.
You can check the status of your amended return here, but allow 3 weeks after filing for it to show up.