# Step 3: Connect WhatsApp

1. Open your Render URL (`https://your-app.onrender.com`) in a browser.
2. Log in with the `AUTH_USER` / `AUTH_PASS` you set in Render.
3. You'll see a **QR code**.
4. On your phone, open WhatsApp:
   - **iOS**: Settings → Linked Devices
   - **Android**: three dots → Linked Devices
5. Tap **Link a Device** and scan the QR code.
6. The page refreshes and shows **"System Operational"** — your backend is now listening.

Continue to [Setup the Frontend](setup-frontend.md).