In the Windows Desktop version, along the bottom there is a section to .....Change (or amend) for Another Reason...and below that you enter the EDIT selection about Wages & Income....which gets you to the full menu of income items, including 1099-INT forms.
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Of course, it may depend on who much Interest income you had as to whether you will owe any more to the IRS...but entering it will let you know.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*