How do I enter my form 1099-Int form when it came from the Department of Treasury and not a bank? It only lets me choose a bank, but the letter came from the IRS.

The letter is telling me to report the interest shown as income on my tax return, but when I go to enter the form 1099INT, I can only choose from banks (mine isn't even an option) and when I try to search for the Department of Treasury, nothing pops up.