It probably will not have any effect on your refund or tax due.....if you need to amend, you do so by changing your answer in MY INFO to the question that asked if someone else could claim you as a dependent. Click your name and go through the questions.
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...
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