It depends.
It sounds like you prepared a 2019 tax return with information for 2018. If so, you will need to amend your 2019 tax return to correct the amounts reported to only reflect 2019 activity.
See the attached link for instructions to help you amend your return.
How to amend my return?
For your 2018 tax return, you will need to prepare it using the software for 2018. You can use the following link to download the software to prepare your return.
How to prepare a prior year tax return
Make sure the year on your source documents, (W-2 forms, 1099 forms, etc) also reflect the year of the tax return you are preparing to ensure the items match what has already been reported to the taxing agencies.
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