If it is a one-time incident, you do not have to pay SE tax, but it is still taxable income. You can't directly enter information onto the form, you must go through the interview process. When you enter the description, be sure to say it was a 1099-NEC and you qualify for sporadic use.
You can add it as Other Income.
- Wages & Income
- I'll choose what I work on
- Less Common Income select Start (or Update) for
- Miscellaneous Income.
- Other reportable income and you can enter your own description(s) and amount(s).