How do I amend my income tax return

For 2024?  If you just e-filed it, you have to wait until it has been fully processed to amend.  And the Form 1040X you will need will not be available until later in February.

If you have already submitted your tax return, wait until you receive an email informing you that it is accepted or rejected. Don't make any changes while your tax return is pending. 

If your tax return is rejected, you may sign in to TurboTax and add your student loan interest along with fixing the rejection. If your tax return is accepted, once it’s processed, you can file an amendment through TurboTax using Form 1040-X. adding your student loan interest.

For further information review the TurboTax articles: How to Correct Federal Tax Returns and Video: How to Amend Your Tax Return.