See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
- In TurboTax, open your tax return
- Click on Federal in the left-hand column, then on Deductions & Credits on top of the screen
- Scroll down to All Tax breaks, locate the section Your Home and click on Show more
- Click Start next to Home Energy Credits
- Follow the interview to enter your information.
