Main menu, 1.7.10

Hello dears!

I create my mod in minecraft 1.7.10.

But, I have while creating my menu, I had a problem.

Here's what I have written in the main class :

    @Mod.EventHandler
    public void preInit(FMLPreInitializationEvent event) throws Exception
    {
        MinecraftForge.EVENT_BUS.register(new RPGMainMenuEvent());
    }

This is what is written in RPGMainMenuEvent :

public class RPGMainMenuEvent  {
	
    public void onGuiOpenEvent(GuiOpenEvent event) {
    	if(event.gui instanceof GuiMainMenu) {
    	   event.gui = new RPGMainMenu(); }}

}

I need help, please throw off the full code of the file RPGMainMenu,

how to make it, that would be gone buttons : Relams and Mods.

Thank you in advance!