This page is live, but it's still pointing at a placeholder config. Open index.html, find firebaseConfig near the bottom, and paste in the config object from your Firebase project (Project settings → General → Your apps → SDK setup).
Then make sure Anonymous sign-in is turned on under Authentication → Sign-in method, and that Firestore is created, so the three of you can actually read and write.
| Date | Person | Entry | Amount | Balance |
|---|