I've filed 2021 using Turbotax online for federal and CA state tax. I forget to file GA state tax. How to add an additional state to previous tax return?

I've filed 2021 using Turbotax online for federal and CA state tax. I forget to file GA state tax. When I go to "Your tax  returns & documents", there's no add a state return button. I tried to use amend, but it requires me to amend either federal or ca state. I don't need to amend them. I just want to add another state. How to do that? 

Thanks,