AFTER your return has been fully processed
See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
To change the answer to the question about whether you can be claimed as someone else's dependent, click your name in MY INFO and to through the screens to the question that asks if you can be claimed and if you will be claimed.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**