Displaying Username After Login (is this possible)?

Hello again! I would like to ask again, but this time, it is about displaying the username who logged into the game. What I did is that I wrote a PHP code that will fetch the username and then used UnityWebRequest.Get() to let the C# script read the PHP file, but then - no success. What only happens is that there is no name displayed on the Welcome Screen.

Here are my codes:

1) LoginInputs

 //Variables
 public InputField UsernameInput;
 public InputField PasswordInput;
 public Button LoginButton;
 public Text message;

 public void FieldCheckLogin() {
     /*LoginButton.onClick.AddListener(() => {
         StartCoroutine(Main.Instance.Web.Login(UsernameInput.text, PasswordInput.text));
     });*/
     message.text = "";
     StartCoroutine(Login(UsernameInput.text, PasswordInput.text));
 }

 public IEnumerator Login(string username, string password)
 {
     WWWForm form = new WWWForm();
     form.AddField("loginUser", username);
     form.AddField("loginPass", password);

     using (UnityWebRequest www = UnityWebRequest.Post("http://localhost/sqlconnect-ChemAR/login.php", form))
     {
         yield return www.SendWebRequest();

         if (www.isNetworkError || www.isHttpError)
         {
             Debug.Log(www.error);
             message.text = www.error;
         }
         else
         {
             Debug.Log(www.downloadHandler.text);
             StartCoroutine(GetDate());
             message.text = www.downloadHandler.text;
         }
     }
 }

 IEnumerator GetDate()
 {
     using (UnityWebRequest www = UnityWebRequest.Get("http://localhost/sqlconnect-ChemAR/GetDate.php"))
     {
         // Request and wait for the desired page.
         yield return www.Send();

         if (www.isNetworkError || www.isHttpError)
         {
             Debug.Log(www.error);
             message.text = www.error;
         }
         else
         {
             //Show results as text
             Debug.Log(www.downloadHandler.text);

             //Or retrieve results as binary data
             byte[] results = www.downloadHandler.data;
             StartCoroutine(PleaseWait());
             SceneManager.LoadScene(3);
         }
     }
 }

 IEnumerator PleaseWait() {
     yield return new WaitForSeconds(5);
 }

 public void VerifyInputsLogin() {
     LoginButton.interactable = (UsernameInput.text.Length >= 8 && PasswordInput.text.Length >= 8);
 }

 /*Conditions if the username and password are correct or not
 public void FieldCheckLogin() {
     if (UsernameInput.text == "" || PasswordInput.text == "")
     {
         message.text = "Please don't leave any of the fields blank.";
     }
 }*/

 //Other Login Inputs will soon to be included (I need to setup a database first.)

2) UsernameDisplay

 //Variables
 public Text UserDisplay;

 // Start is called before the first frame update
 void Start()
 {
     StartCoroutine(GetUsername());
 }

 IEnumerator GetUsername() {
     using (UnityWebRequest www = UnityWebRequest.Get("http://localhost/sqlconnect-ChemAR/displayuserlogged.php")) {
         yield return www.Send();

         if (www.isNetworkError || www.isHttpError)
         {
             Debug.Log(www.error);
         }
         else
         {
             //Show results as text
             Debug.Log(www.downloadHandler.text);

             //Or retrieve results as binary data
             byte[] results = www.downloadHandler.data;
         }
     }

 }