Please see these instructions for amending a return in TurboTax Online:
https://ttlc.intuit.com/replies/5567856
Once the return is available for editing, you can change your dependent status.
To indicate that you can be claimed by someone else as a dependent you will need to do the following:
1. Log in to TurboTax Online
2. Click on Take me to my return
3. Once in your return, click Personal Info
4. Locate your name and click the Edit button
5. On the following screen, near the bottom, you will choose “Yes” to the statement Someone else can claim me as a dependent on their tax return and click Continue.
Once you have finished amending the return, you will need to print and mail the amended return to the IRS. The IRS does not allow amended returns to be efiled. It takes 8-12 weeks for the IRS to process amended return.
