1. Go to console.firebase.google.com → Create a project (free)

2. In the project: Build → Realtime Database → Create database → Start in test mode

3. Go to Project Settings → General → Your apps → </> Web → Register app → copy the firebaseConfig object

4. Paste the values into the FIREBASE_CONFIG block at the top of this file's <script> section

5. Set Realtime Database rules to ".read": true, ".write": true (for internal team use)