If you already filed your return, you cannot make changes unless you elect to amend. To amend, please see the instructions on the page How to amend (change or correct) a return you've already filed.
Since you already filed, do you have an amount on Schedule 1, Line 1 on the printed copy of your return? This schedule is different from your Schedule A, which is itemized deductions. The total of Schedule 1 flows to Line 8 of your 1040. If your tax refund was taxable, then it would appear on Schedule 1. If it does not show up on Schedule 1, then the refund did not affect your tax return.
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