Problem with menu

Good afternoon.

I have just started to learn and to program arduino.
I wrote a program that detects the temperature and lights the LED by exceeding a certain value.

But I need a menu for putting this value down, and later to extend the functionality of the program.
The easiest for me, described in the libraries on this website, is menubackend.h.

Please,prompt how by this example, when choosing a submenu “Settings” with the help of PIN buttons up / down, the value from 0 to 10 could be changed?

#include <MenuBackend.h>

/*
    This is the structure of the modelled menu
   
    Settings
        Pin
        Debug
    Options
        Delay (D)
            100 ms
            200 ms
            300 ms
            400 ms
*/

//this controls the menu backend and the event generation
MenuBackend menu = MenuBackend(menuUseEvent,menuChangeEvent);
    //beneath is list of menu items needed to build the menu
    MenuItem settings = MenuItem("Settings");
        MenuItem pin = MenuItem("Pin");
        MenuItem debug = MenuItem("Debug");
    MenuItem options = MenuItem("Options");
        MenuItem setDelay = MenuItem("Delay",'D');
            MenuItem d100 = MenuItem("100 ms");
            MenuItem d200 = MenuItem("200 ms");
            MenuItem d300 = MenuItem("300 ms");
            MenuItem d400 = MenuItem("400 ms");
   
//this function builds the menu and connects the correct items together
void menuSetup()
{
    Serial.println("Setting up menu...");
    //add the file menu to the menu root
    menu.getRoot().add(settings);
        //setup the settings menu item
        settings.addRight(pin);
            //we want looping both up and down
            pin.addBefore(debug);
            pin.addAfter(debug);
            debug.addAfter(pin);
            //we want a left movement to pint to settings from anywhere
            debug.addLeft(settings);
            pin.addLeft(settings);
    settings.addBefore(options);
    settings.addAfter(options);
        options.addRight(setDelay);
            setDelay.addLeft(options);
            setDelay.addRight(d100);
                d100.addBefore(d100); //loop to d400
                d100.addAfter(d200);
                d200.addAfter(d300);
                d300.addAfter(d400);
                d400.addAfter(d100); //loop back to d100
                //we want left to always be bak to delay
                d100.addLeft(setDelay);
                d200.addLeft(setDelay);
                d300.addLeft(setDelay);
                d400.addLeft(setDelay);
    options.addAfter(options);
}

/*
    This is an important function
    Here all use events are handled
   
    This is where you define a behaviour for a menu item
*/
void menuUseEvent(MenuUseEvent used)
{
    Serial.print("Menu use ");
    Serial.println(used.item.getName());
    if (used.item == setDelay) //comparison agains a known item
    {
        Serial.println("menuUseEvent found Dealy (D)");
    }
}

/*
    This is an important function
    Here we get a notification whenever the user changes the menu
    That is, when the menu is navigated
*/
void menuChangeEvent(MenuChangeEvent changed)
{
    Serial.print("Menu change ");
    Serial.print(changed.from.getName());
    Serial.print(" ");
    Serial.println(changed.to.getName());
}

void setup()
{
    Serial.begin(9600);
   
    menuSetup();
    Serial.println("Starting navigation:\r\nUp: w  Down: s  Left: a  Right: d  Use: e");
}

void loop()
{
    if (Serial.available()) {
        byte read = Serial.read();
        switch (read) {
            case 'w': menu.moveUp(); break;
            case 's': menu.moveDown(); break;
            case 'd': menu.moveRight(); break;
            case 'a': menu.moveLeft(); break;
            case 'e': menu.use(); break;
        }
    }
}