I already filed my taxes and forgot to add a 1098-T. I know i have to amend my return but on my account it doesnt have that button.

[DoninGA]

To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Amend (change) return

[JulieR]

If your returns were e-filed today and you filed both Federal and state returns, you'll need to wait until both of returns are completely processed before you are able to start an amended return.