how to enter 1099-misc for classroom instruction only not a business

It depends. If this is an incidental and isolated position, in other words not a business you plan to continue you can enter the income using the instructions below. No expenses will be allowed when using this method. You can delete your 1099-MISC and enter using the steps below.

You'll need to delete this form 1099-MISC. 

• If you're using TurboTax Online software and need to delete a form, click here.
• If you're using TurboTax Desktop software and need to delete a form, click here.

Other Miscellaneous Income:

1. Sign into your TurboTax Online account
2. Go to Tax Home (left panel)  Wages and Income  section
3. Scroll to  Less Common Income > Select  Miscellaneous Income, 1099-A, 1099-C
4. Select Other reportable Income > Enter a description (----) and the amount