How do I change my business address? I'm at the general info screen but there is no "edit" button under business address.

That is a known issue 

https://ttlc.intuit.com/replies/7267292

This is still a problem. I entered the wrong state but correct zip code. Turbo Tax sees a zip code error but  the actual error is my my state and it won't let me edit that field. How can I fix it?

Are you trying to edit it in the review or by going back through the interview in the program? 

You can revisit the section needed to make changes by using the topic search feature in TurboTax Online. On the left-hand side go to Tax Tools>Tools >Topic Search or Topic List. Then type the section or form that you need to update in the search box and click Go.

@AliMari