How Do You Connect MIT App Inventor with Firebase | Real-Time Database?

I followed the instruction of this video but it doesn't work. Can someone help me? I am just a beginner. What should I fill in for FirebaseToken, FirebaseURL, and ProjectBucket? I pasted the link displayed by Firebase Realtime into FirebaseURL based on the video. However, I noticed that the video ends in .com, while my link ends in .app. Also, what should I fill in for FirebaseToken? I initially filled in Database Secrets, but MIT still can't connect to Firebase Realtime.
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You need to use the us-central server if using the firebase component in AppInventor