Our case was we had just had our app approved and then published for the first time. That meant we had one release "1.0.0 Ready for sale". When looking at the age rating it just said view, and did not say edit. I couldn't find a way to edit this.
So I created a new release, named it 1.0.1, and just save it without any other changes/content in it. I Now had two releases and 1.0.1 was "Prepare for Submission".
Then I could go to the App Information -> Age Rating and it DID have the edit button.
goodempire
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