Did you get also get a W-2 from the same employer? If not, you are self-employed. Whoever gave you the 1099-MISC is treating you as an independent contractor, not as an employee. They are not your employer, they are your client, and you are in business for yourself. You have to report the income as business income, which is what TurboTax is directing you to.
If you did get a W-2 from the same employer, explain what the payment on the 1099-MISC is for, and why it was not included in your W-2, and I will tell you how to enter it.
