UPDATED FOR TAX YEAR 2019
To get back into your return after you've filed it, please follow the steps in this article: How can I access my return after I've e-filed or printed it?
Once you are back in your return you will be able to go to your state return by clicking State in the black bar on the left. From there you can navigate to your city return.
[Edited | 4/15/2020 | 12:01pm PDT]