Enter a 1099-Int under
Federal on left
Wages & Income at top
Interest and Dividends
Interest on 1099INT - Click the Start or Revisit button

The first screen asks for the bank name,  don't enter the bank.  scroll down and click on Change the way I enter it and then on the next screen pick I'll type it in mysefl.

You get the Form 1099-INT from your financial institution, not from TurboTax.