How to add 1098-t for already filed Tax

You will need to wait to see if your return is accepted or rejected. If rejected, you may correct and resubmit. If it is accepted, you will need to file an amendment. For amendment instructions, please see the TurboTax FAQ below. Before you amend, read this to make sure you need to.

Please remember:

Three weeks after you mailed your amendment, you can start tracking its progress at the IRS  Where's My Amended Return?  site.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

• You're free to cash your refund check or spend it once you have it. You don't need to wait for your amendment to finish processing, which can take another 3-4 months.
• If you owe money after amending, you'll just include payment with your mailed amendment form.
• And if your amendment results in a second refund, you'll get a check for the additional amount.

An amended return, Form 1040X, can only be printed and mailed to the IRS, it cannot be e-filed.  

The IRS will take 16 weeks or longer to process an amended tax return.

https://ttlc.intuit.com/replies/5114064

See above.