Are you sure you need to amend? What changed? Generally, the 1098-T is only any informational document.
You claim the tuition credit, or report scholarship income, based on your own financial records, not the 1098-T.
That said,
How to amend: https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
