This TurboTax FAQ tells you how to make changes to a tax return that has already been filed:
trojanhorse4562
Level 2
ethantsui12345
New Member
iluvthai-5072881
New Member
klamariie
New Member
danielhenry916-g
New Member
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.