Question on How to Get To Estimated Taxes Section

Hey guys, if anyone can help me with this, I've been doing estimated taxes this year. And just now I was going in to change my quarterly earning as it changed from what I originally estimated, but when I got to the main page the 'add a state' button is no longer present, or am I just missing it? Should I just go to 'amend taxes' which is there under the right column towards bottom of page?

 

I hope that makes sense, thank you!