Since you have already filed your return, you'll
need to wait for your tax return to either be rejected or accepted, if it is rejected you can
add any corrections or information that you need to add, correct any
other errors on the return and resubmit it. If it is accepted, you will need to amend your return to any
corrections or information that you did not include on your original
return. You cannot e-file an amended return as this cannot be filed.
You will need to print and mail the amended return in order to file
it. Please see the following TurboTax FAQ for instructions on
how to amend your 2016 tax return in TurboTax.
https://ttlc.intuit.com/replies/3288565