How to Hide the "Foodii.si - Nastavitve" Admin Menu

function plt_hide_foodii_si_menus() {
	//Hide the "Foodii.si - Nastavitve" menu.
	remove_menu_page('foodii-si-settings');
}

add_action('admin_menu', 'plt_hide_foodii_si_menus', 11);

Where do I put this code?