Age rating -

https://help.apple.com/app-store-connect/#/dev599d50efb

1. Go to iTunes Connect > My Apps > Your app.
2. Under App Store, from the left pane, click on 1.0 Prepare for Submission. (Note that 1.0 may vary depending on your app version.)
3. Under General App Information, Rating may be edited.

https://lh5.googleusercontent.com/pWskbJxqpMSaRgt_CYcMuZTuJQS7k27YzCe2AYLDNhRBjXKjH5OK3c85mvEkXthAPSHQ069zI3LlNL26pXtsovRJvkwJYVcB-xxYPSsk6aQ57hbaCKQ5sdnP1y1Z4DsZnenMJkFsjSoipnQuaDJExJc

Build -

https://help.apple.com/app-store-connect/#/dev7cbda8c55

Scroll to the “Build” section in your app’s App Store Connect record.

https://lh4.googleusercontent.com/SGf0H0zOjqLWIDNQrkKGteTBdT9hfuBPhozyVzh8bD7fuibXhBgEWD7qHVKugRsztSkfdRNem53F8jntrO2cPRtYi62yYZ58hhzX5dMLcv3z9N59OhRQGnRqrrN3hgN8_JRklYW_GzMqy08k8e5WlRs

Click on “Select a build before you submit your app.”

Choose the build that you uploaded through Xcode. Click Done in the bottom right-hand corner, then Save in the top-right hand corner, then Submit for Review.

https://lh6.googleusercontent.com/BZm924gz0lo3q1AjnbGK_7fjy6BTR53Yl4m0tERexUxhz5nHe4OV3iDAPld4TKjwO_wn3JLHVt57R_DLPsTrNJvAk20V1gqtB63McbV9BvvdIovfqmFuB1KrG6kCyseB2J9XZLmal3mDC3GDC6ll-dw