How do I enter a stipend I received for exam item reviewing? $250 for my professional organization. No tax forms received, but I gave them a W-9 in order to be paid.

It sounds like the work you did is associated with your profession and you were compensated for services rendered, so it is possible the IRS would consider it self-employment income. As such you are subject to about a  $38 charge for self-employment tax, plus income taxes. You would be entitled to the qualified business income deduction (QBI) if it was self-employment income. 

However, if it is an uncommon thing you do, it could also be considered "other income" and not subject to the self-employment tax or the QBI deduction. If you make that determination, you can enter it as Other Income as follows:

1. From the Federal menu in TurboTax find Wages and Income 

2. Find Less Common Income

3. Choose Miscellaneous Income, 1099-A, 1099-C

4. Choose Other Reportable Income

5. Enter a description of the income and the amount