You may be able to edit your original return. It depends on whether your e-filed return is accepted or rejected.
If your e-filed return is rejected, you'll be able to make any changes and add more information as needed.
If your e-filed return is accepted, you can't make changes to your original return. However, when you receive the refund on your original return, you can amend your return and make the changes as needed.
If you do need to amend, please see the TurboTax Help article How to amend (change or correct) a return you already filed for instruction on how to amend your previously-filed tax return.