You can add the interest income by using the steps here.
- Sign into your TurboTax account (online or desktop)
- Select Search box in the upper right,
- Search for 1099int, then Jump to 1099int (see image attached)
- Continue to the interest list > Add Interest Income button
- Delete beside the additional interest incomes (see the image attached)
- Click the screenshots attached to enlarge and view for assistance
