How do I fix an error on my filed return?

[MicheleR]

To make corrections on a return that was already filed and not rejected, you will need to complete an Amended Return.

To do this, please follow the steps below. 

NOTE: you should make sure you have a copy of the original return prior to amending.

TurboTax FAQ - How to amend (change or correct) a return you already filed

https://ttlc.intuit.com/replies/3288565