You are not required to pay self employment tax on income of less than $400. However, if you must file a tax return due to receiving other income, you must enter the self employment income on your tax return regardless of how small the amount is because all income from all sources must be entered on your tax return and you must pay federal income tax on it.
You will not be able to use the Free Edition to enter the self employment income. If you had no expenses associated with the income, you can upgrade to Deluxe and enter the income. If you had expenses, you must upgrade to Self Employed.
There is another free product from the IRS Free File Program what you might be able to use. Here are the limitations for using it this year. They will probably be similar for 2020 tax returns.
You qualify if you had $36,000 or less AGI or $69,000 or less military family AGI or qualify for EITC. Click on See if you qualify then Yes (if you do) then Start Now button, then choose Create an Account.
https://ttlc.intuit.com/questions/2026912-how-do-i-switch-to-turbotax-free-file-program
