Can’t add environment variables to App Runner

I need to add environment variables to my running App Runner app … but the option under Service Settings does not show up. ???

I’m following the instructions show here … but the option does not show up when editing Service Setting. So what so I try? Am I missing something here? Hmm… Thanks for any help!

Screenshots are not showing here ... ugh. Here is the link to the instruction page (see steps 2 and 3) https://docs.aws.amazon.com/apprunner/latest/dg/env-variable-manage.html

In my App Runner app this option is not available/showing when I edit Service Settings.

The app is running -- do I need to pause the service/app before I can make this change?