How to Hide WP Email Template LITE Admin Menus

function plt_hide_wp_email_template_menus() {
	//Hide the "WP Email" menu.
	remove_menu_page('wp_email_template');
	//Hide the "WP Email → Template" menu.
	remove_submenu_page('wp_email_template', 'wp_email_template');
	//Hide the "WP Email → Send WP Emails" menu.
	remove_submenu_page('wp_email_template', 'send_wp_emails');
}

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

Where do I put this code?