private void TokensSlide()
        {
            TutorialGUI.Paragraph(
                "Copy the game token and editor key you will see after " +
                "game creation into these fields and click the button."
                );

            TutorialGUI.Form(() => {
                if (preferences == null)
                {
                    preferences = UnisavePreferences.LoadOrCreate();
                }

                preferences.GameToken = EditorGUILayout.TextField(
                    "Game token", preferences.GameToken
                    );
                preferences.EditorKey = EditorGUILayout.TextField(
                    "Editor key", preferences.EditorKey
                    );

                if (GUILayout.Button("Save preferences & upload the backend"))
                {
                    preferences.BackendFolder = BackendFolderPath;
                    preferences.Save();

                    Uploader
                    .GetDefaultInstance()
                    .UploadBackend(
                        verbose: true,
                        useAnotherThread: true
                        );
                }
            });
        }
        private void WhatNextSlide()
        {
            TutorialGUI.Paragraph(
                "Now you can freely explore the example, it should be " +
                "all configured to talk with the cloud as the game " +
                "you've just created."
                );

            TutorialGUI.Paragraph(
                "- try registering players and logging in"
                );

            TutorialGUI.Paragraph(
                "- open the database and view the registered players"
                );

            TutorialGUI.Paragraph(
                "- this example was created from the <i>Email " +
                "authentication</i> template. Go explore its documentation " +
                "and learn more at:"
                );

            TutorialGUI.Form(() => {
                string url = "https://unisave.cloud/docs/email-authentication";
                if (GUILayout.Button(url))
                {
                    Application.OpenURL(url);
                }
            });
        }
        private void RegistrationSlide()
        {
            TutorialGUI.Paragraph(
                "Register yourself at the Unisave web to be able to access " +
                "the web app."
                );

            TutorialGUI.Form(() => {
                if (GUILayout.Button("Open https://unisave.cloud/"))
                {
                    Application.OpenURL("https://unisave.cloud/");
                }
            });

            TutorialGUI.Paragraph(
                "Then create a new game in the web app."
                );
        }