You need to enter it through the 1099-INT screens. After you have logged in and are in your return in TurboTax Online:
- Go to Search at the top of the screen.
- Enter Form 1099-INT in the search box.
- You will see a Jump To function that will take you to the 1099-INT input screens.
- Then add a new 1099-INT and manually enter your 1099-INT.
At the financial services screens, click "Change how I enter my form" then "Type it myself"