You need to file an amended return for 2018 to take a deduction for the amount contributed.
Link to How to File an Amended Return Using Turbo Tax
If you cannot deduct the contribution in 2018 a form 8606 is generated as part of your tax return. This information then becomes a part of your 2019 return to show that you did not receive a deduction for the contribution to your IRA account.
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