I donate plasma, where do I enter this amount when filing?

I assume you are referring to the income received for plasma donation. This is Miscellaneous Taxable Income.

How to report in TurboTax

1. Select Federal Taxes,
2. Select Wages & Income, 
3. Click on Miscellaneous Income, 1099-A, 1099-C category.
4. Click on the Start/Update button next to Other reportable income
5. Follow the prompts.