What you received is considered self-employment income, as the IRS considers you "in business" for yourself for that specific income. So you'll report it in the Business Income & Expenses (SCH C) section of the program. Depending on what version you're using, that's either under the Business tab or the Personal Income tab.
Note that a 1099-MISC or any other tax document is NOT required. The IRS expects you to keep your own records of your business income and expenses, and use them to complete your tax return. So when the program asks if you received any 1099-MISC's, just select NO and press on.