How to Hide Contact Form Maker Admin Menus

function plt_hide_contact_form_maker_menus() {
	//Hide "Contact Form".
	remove_menu_page('manage_fmc');
	//Hide "Contact Form → Forms".
	remove_submenu_page('manage_fmc', 'manage_fmc');
	//Hide "Contact Form → Submissions".
	remove_submenu_page('manage_fmc', 'submissions_fmc');
	//Hide "Contact Form → Themes".
	remove_submenu_page('manage_fmc', 'themes_fmc');
	//Hide "Contact Form → Options".
	remove_submenu_page('manage_fmc', 'options_fmc');
	//Hide "Contact Form → Premium Version".
	remove_submenu_page('manage_fmc', 'pricing_fmc');
	//Hide "Contact Form → Ask a question".
	remove_submenu_page('manage_fmc', 'https://wordpress.org/support/plugin/contact-form-maker/#new-post');
	//Hide "Contact Form → Add-ons".
	remove_submenu_page('manage_fmc', 'addons_fmc');
	//Hide "Contact Form → Overview".
	remove_submenu_page('manage_fmc', 'overview_cfm');
}

add_action('admin_menu', 'plt_hide_contact_form_maker_menus', 11);
Where do I put this code?