A W2-G has box 1 for Winnings. Did you get a W2G or 1099Misc? If you are trying to file it as self employment income and didn't get a 1099Misc enter it as Other Cash Income.
How to enter income from Self Employment
https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...
