Under Education I check No for a 1098T, now I have one and turbotax auto skips that section. Not letting me go back to add the 1098T

If for some reason the instructions shown below don't take you to the summary screen where you can make your changes, but instead take you somewhere "in the middle" of the Education interview, then Continue through the Education interview questions until the end and you should see the summary screen there where you can add your 1098-T.

Here is the path to get you to your starting point in TurboTax Online:

Federal>Deductions & Credits>Education>Expenses and Scholarships (Form 1098T)

Or, you can click the "magnifying glass Search" icon on the top row and enter "education expenses" in the search window, and then click the "Jump to education expenses" link.