Firebase custom event parameter is missing

I imported FirebaseAnalytics.unitypackage into my project and am trying to make a custom event with a parameter. The event was successfully displayed in the Firebase Console, but the parameter is not displayed. This guide

shows that after the event appears in the console, you need to press the "edit parameter reporting" button, but I don't have it. What to do?

 

This is late for this request, but I'm hoping this will help others. I'm currently working through this and have contacted Firebase support multiple times. The video above is out of date, edit parameter reporting has been deprecated. A custom dimension (text) or custom metric (number) need to be created for your parameters. Here is the link to the documentation - https://support.google.com/firebase/answer/10075209