You might have to use the Desktop program. Download the .tax2023 file and open it in the Desktop program. Then make a copy (do File-Save As and give it another name) of the file which you have to do anyway to amend. You will still have the original file with the original federal and state returns. Then in the copy you can amend. You probably will have to go though the federal section first to amend. What do you need to change on your state return? Which state?
How to amend a prior year return
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
