'how to insert data into firebase database

how to insert data into Firebase database | when i try to inset it , ncaught TypeError: firebase.database is not a function at HTMLButtonElement.document.getElementById.onclick is showing!

<body>

  <script type="module">

    import { initializeApp } from "https://www.gstatic.com/firebasejs/9.0.0/firebase-app.js";
    import { getAnalytics } from "https://www.gstatic.com/firebasejs/9.0.0/firebase-analytics.js";
    const firebaseConfig = {
      apiKey: "AIzaSyD0rVK4xzKsfoKBW0wcurYzWiEID-3jlws",
      authDomain: "web-job-app.firebaseapp.com",
      databaseURL: "https://web-job-app.firebaseio.com",
      projectId: "web-job-app",
      storageBucket: "web-job-app.appspot.com",
      messagingSenderId: "804961627520",
      appId: "1:804961627520:web:d3d899152ef70588052565"
    };

    // Initialize Firebase
    const app = initializeApp(firebaseConfig);
    const analytics = getAnalytics(app);

    // -------------- READY DATA ------------------//
    var imageurl, title, loadUrl;
    function ready() {
      imageurl = document.getElementById("imageurl").value;
      title = document.getElementById("title").value;
      loadUrl = document.getElementById("loadUrl").value;
    }

    // -------------- WRITE PROSSES ------------------//

    document.getElementById('btn').onclick = function () {
      ready()
      firebase.database().ref('theme').set({

        ImageUrl: imageurl,
        Title: title,
        ClickUrl: loadUrl
      });

    }




  </script>



</body>

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