I answered "no" to the virtual currency question, but realize that I should have answered "yes". How do I amend my tax return properly to reflect this?

I was under the impression that the virtual currency question "At any time during 2021, did you receive, sell, exchange, or otherwise dispose of any financial interest in any virtual currency?" only applied to cryptocurrency, but found out that it does not. I have a small side-business in an online game that allows users to exchange in-game currency for USD. How do I amend my tax return to account for this?