Hello @RachelV ! I am happy to assist you today.
Here is a great link with the steps you need to take to amend your return if you used TurboTax: Amendment Instructions .
To amend, you would need to go through the personal information questions and indicate that you are not a dependent. Make sure to answer all of the questions. The system should then reflect a refund since you have a higher standard deduction filing as a single nondependent. You should be able to efile the amendment as well.
Please reach back you if you need any further clarification!
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