Issues writing to Firebase Realtime Database

I have written the following code to test writing to a Firebase Realtime Database. It wrote data to the database once, but after that will do nothing. Currently, I am just trying to save the first name that the user enters on a form after they press the submit button.

<script type="module">
  
    // Import the functions you need from the SDKs you need
  
    import { initializeApp } from "https://www.gstatic.com/firebasejs/10.4.0/firebase-app.js";
  
    // TODO: Add SDKs for Firebase products that you want to use
  
    // https://firebase.google.com/docs/web/setup#available-libraries
  
  
    // Your web app's Firebase configuration
  
    const firebaseConfig = {
  
      apiKey: "AIzaSyAEGiSKDCg0nkrSxHshqxPEUWxtGI1NP7Q",
  
      authDomain: "wrud-d63af.firebaseapp.com",
  
      databaseURL: "https://wrud-d63af-default-rtdb.firebaseio.com",
  
      projectId: "wrud-d63af",
  
      storageBucket: "wrud-d63af.appspot.com",
  
      messagingSenderId: "491961850138",
  
      appId: "1:491961850138:web:2468aff8d84e08c40ff4a3"
  
    };

    
    
      // Initialize Firebase
    
      const app = initializeApp(firebaseConfig);
      
      import {getDatabase, set, get, update, remove, ref, child} from "https://www.gstatic.com/firebasejs/10.4.0/firebase-database.js"
      
      const db = getDatabase()
      
      var fname = document.getElementById("fname")
      var submitBtn = document.getElementById("submitBtn")
      
      
      function save(){
        
          
          set(ref(db, "/"), {
              Name: fname.value
          })
          
      }
      
      
      submitBtn.addEventListener('click', save)
      
    
    </script>