You must first prepare a duplicate tax return exactly the way it was originally filed. You can then start the amended return to make the necessary changes. To prepare your duplicate return, you would need to create an account in TurboTax online or download one of the CD/download versions. You can download or buy the CD/Download version for 2018 at this link https://turbotax.intuit.com/personal-taxes/past-years-products
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