For Form W-2, enter it in the regular wage section exactly as received. It is okay that you are reporting a zero for income. This will allow TurboTax to properly report that income taxes were withheld.
If you are not sure how to get to this area of your tax return, enter W-2 in the search box and select the Jump to link. Select Enter my W-2 now and Continue.
Yes, you are correct that the stipend details should be reported in the education section.
For the most recent details regarding graduate student income, see: Are my scholarships, fellowships, or grants taxable?
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