You cannot enter a 1099Misc or self-employment income when you are using the Free Edition. If you qualify, there is another free software program available from TurboTax which will allow you to enter self-employment income.
Try Free File:
You qualify if your income was $34,000 or less, or $66,000 or less if active duty military, or if you qualify for Earned Income Credit
https://ttlc.intuit.com/questions/1900583-what-is-turbotax-free-file-program
You must use a different account and user ID when you switch to Free File.