Get your taxes done using TurboTax

I filed my state taxes on Mar 28, because the TurboTax guidance page (https://ttlc.intuit.com/community/internal-revenue-service/help/how-is-my-state-taxing-unemployment-...)

said "TurboTax calculations are correct and up-to-date for your state. You can go ahead and finish and file your state return."

I just went into my account to check something, and the amount due on my state taxes has changed. Since I have already filed and paid my state taxes, I guess I have to file an amended return, correct? I can't see where to do that on my TurboTax account - can someone help? Thanks.