It depends.
If you have already filed a tax return for 2017 and 2018, you will need to submit an amended return. You cannot just send the tax forms in as if they were never filed before.
For New York, you will need to file your amended returns on Form IT-203-X for each applicable year. You will need to mail the amended returns in.
Please see the following link for instructions on preparing the amended New York returns.
Instructions for filing amended New York tax returns
The following link can be used to assist you with preparing the amended returns using TurboTax.
Steps for amending state returns in TurboTax
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