find the 1099-DIV which reported this income, when you edit that 1099-DIV and select 'continue' on the screen with the amounts/boxes you should get some interview questions whether some of this was US Government Interest and then get a supplemental box to enter the $ amount.
If you on desktop a quicker way is to go to Forms mode, select the 1099-DIV worksheet underneath Schedule B and there will be a place to input it right at the top under Box 1a.
