I'll assume you have already started amending an online 2020 return and are asking how to get to the interview to enter a Form 1099-INT.

• With the return open, click on the Search tab in the upper right corner.
• In the search box enter the term 1099-INT without quotes, and click the adjacent small magnifying glass.
• Then click the link Jump to 1099-INT.

If you have any problem with that method, here's another way:

• With the return open, go to the left menu column and click on TAX TOOLS then TOOLS.
• In the Tools window click on Topic Search.
• In the topic line enter 1099-INT.
• Make the selection in the list and click GO.