Implement demo day changes - DO NOT MERGE

Assets/Accounts/Scripts/UserCreationScreen.cs

@@ -44,6 +44,16 @@ public class UserCreationScreen : MonoBehaviour
     /// </summary>
     private List<Image> avatars = new List<Image>();
 
+    /// <summary>
+    /// Reference to the back button, so we can deactivate it when the user cannot go back (when no user is found at startup)
+    /// </summary>
+    public GameObject backButton;
+
+    /// <summary>
+    /// Boolean used to check whether the user can go back to the previous scene
+    /// </summary>
+    public static bool canGoBack = true;
+
 
     /// <summary>
     /// Start is called before the first frame update
@@ -51,6 +61,10 @@ public class UserCreationScreen : MonoBehaviour
     void Start()
     {
         errorMessage.SetActive(false);
+        backButton.SetActive(canGoBack);
+
+        // Reset to default value
+        UserCreationScreen.canGoBack = true;
 
         for (int i = 0; i < UserList.AVATARS.Count; i++)
         {