So far, I've created an authentication system using firebase but database doesn't work as it should

How to save firebase Realtime database in currently signed in users ID ? I'm able to post and retrieve data into firebase but it creates new users every time i put data into fields. Please share some code snippet on how to save and retrieve data into current Firebaseuser using c#. It'd mean a lot to me.

Here is the code that I'm using: using System.Collections; using System.Collections.Generic; using UnityEngine; using Firebase; using Firebase.Database; //using Firebase.Unity.Editor; using UnityEngine.UI; using Firebase.Extensions; using Firebase.Firestore; using System; using Firebase.Auth;

public class User {

     public string score;
     public string name;
     public string email;
     public string bio;
     public string timeStamp;
    
    
     public User ()
     {
     }
 
     public User (string score, string name, string email, string bio, string timeStamp)
     {
             this.name = name;
             this.email = email;
             this.bio = bio;
             this.timeStamp = timeStamp;
             this.score = score;
     }

}

public class RealtimeDatabase : MonoBehaviour { DatabaseReference reference; DatabaseReference reference2; public InputField nameInput; public InputField emailInput; public InputField bioInput; public Text msg; string docEmail; public GameObject prefab; public Transform userBarParent; public Text eventListener; string eventText; ///

     void Start ()
     {
             //FirebaseApp.DefaultInstance.SetEditorDatabaseUrl (Constant.FirebaseDatabaseURL);
             reference = FirebaseDatabase.DefaultInstance.RootReference;
             reference2 = FirebaseDatabase.DefaultInstance.GetReference ("users");
 
             reference2.ChildAdded += HandleChildAdded;
             reference2.ChildChanged += HandleChildChanged;
             reference2.ChildRemoved += HandleChildRemoved;
             reference2.ChildMoved += HandleChildMoved;
     Score.cashValue += 350;
     }
 
 public void AddNewData()
 {
         msg.text = "Adding Data...";
         User user = new User(scoreText.text, nameInput.text, emailInput.text, bioInput.text, DateTime.Now.ToString());
      
         string json = JsonUtility.ToJson(user);
         reference.Child("users").Child(user.email).SetRawJsonValueAsync(json);
         Debug.Log("RTDB Updated");
         msg.text = "Data Added !";
         eventText = "New Child Added";
 }
   
 public void ClearData ()
     {
 
     foreach (Transform child in userBarParent.transform) {
         Destroy (child.gameObject);
     }
 }
 
 
 
     public void GetUsersData ()
     {
             FirebaseDatabase db = FirebaseDatabase.DefaultInstance;
             db.GetReference ("users").OrderByChild("timeStamp").LimitToFirst (10).GetValueAsync ().ContinueWithOnMainThread (task => {
                     if (task.IsFaulted) {
                            
                     } else if (task.IsCompleted) {
                             DataSnapshot snapshot = task.Result;
                             foreach (DataSnapshot user in snapshot.Children) {
                                     IDictionary dictUser = (IDictionary)user.Value;
                                     Debug.Log ( dictUser ["bio"]);
 
                                     GameObject userBar = Instantiate (prefab, transform.position, transform.rotation);
                                     userBar.transform.SetParent (userBarParent, false);
                                     userBar.transform.GetChild (0).GetComponent<Text> ().text = "Name: "+dictUser ["name"];
                                     userBar.transform.GetChild (1).GetComponent<Text> ().text = "Bio: "+dictUser ["bio"];
                                     userBar.transform.GetChild(2).GetComponent<Text>().text = "Score" + dictUser["score"];
                             }
                     }
             });
     }
 
     void HandleChildAdded (object sender, ChildChangedEventArgs args)
     {
             if (args.DatabaseError != null) {
                     Debug.LogError (args.DatabaseError.Message);
                     return;
             }
             // This is fired when new child is added
             Debug.Log ("Child Added");
             eventListener.text = eventText;
     }
 
     void HandleChildChanged (object sender, ChildChangedEventArgs args)
     {
             if (args.DatabaseError != null) {
                     Debug.LogError (args.DatabaseError.Message);
                     return;
             }
             // This is fired when child gets updated
 
             Debug.Log ("Child Changed");
     }
 
     void HandleChildRemoved (object sender, ChildChangedEventArgs args)
     {
             if (args.DatabaseError != null) {
                     Debug.LogError (args.DatabaseError.Message);
                     return;
             }
             // This is fired when child gets removed
 
             Debug.Log ("Child Removed");
     }
 
     void HandleChildMoved (object sender, ChildChangedEventArgs args)
     {
             if (args.DatabaseError != null) {
                     Debug.LogError (args.DatabaseError.Message);
                     return;
             }
             // This is fired when child reorder (order-by query)
 
             Debug.Log ("Child Moved");
     }
 
 
     //Remove Listner OnDestroy
 
 private void OnDestroy ()
 {
             reference2.ChildAdded -= HandleChildAdded;
             reference2.ChildChanged -= HandleChildChanged;
             reference2.ChildRemoved -= HandleChildRemoved;
             reference2.ChildMoved -= HandleChildMoved;
     }

}