WoWInterface - Adding button to the menu

Hi guys, I have a problem with adding button to the menu.
There are a lot of tips how to do it but most of them don't work (idk why).
I found in this addon https://www.wowinterface.com/downloa...AddFriend.html and its code is working.

Code:

AFriend = LibStub("AceAddon-3.0"):NewAddon("AFriend", "AceHook-3.0");

local AFriend = AFriend;

local AFriendButtons = {};

local AfriendMenu = {};

local AButtons = "QR_code";

local AButtonTxt = "QR code";

local AToolTips = "Generate QR code";

local redColor, greenColor = "|cffff2020", "|cff20ff20";

local gsub, ipairs = gsub, ipairs;

local UnitGUID, UnitName, UnitCanCooperate = UnitGUID, UnitName, UnitCanCooperate;

local UIDropDownMenu_CreateInfo, UIDropDownMenu_AddButton = UIDropDownMenu_CreateInfo, UIDropDownMenu_AddButton;

local frameTypes = {["FRIEND"]=1,["PLAYER"]=1,["PARTY"]=1,["RAID_PLAYER"]=1,["RAID"]=1,["PET"]=false,["SELF"]=false};



function AFriend:OnEnable()

        self:SecureHook("UnitPopup_ShowMenu");

end



function AFriend:UnitPopup_ShowMenu(dropdownMenu, which, unit, name, userData)

        local thisName = name or UnitName(unit);

        which = gsub(which, "PB4_", "");

        if not frameTypes[which] then return; end

        if thisName == UnitName("player") then return; end

        if (UIDROPDOWNMENU_MENU_LEVEL > 1) then return; end

        local info = UIDropDownMenu_CreateInfo();

                info.text=AButtonTxt;

                info.value=AButtons;

                info.owner=which;

                info.func=handlerb;

                info.notCheckable=1;

                info.colorCode=redColor;

                info.arg1 = {["unit"]=unit, ["name"]=thisName};

                info.tooltipTitle=AButtonTxt;

                info.tooltipText=AToolTips;

                UIDropDownMenu_AddButton(info);

end

But I have no idea how to extend this code to LFG menu https://ibb.co/mWStaf
Can someone help me please?