How to Hide WP FOFT Loader DEV Admin Menus

function plt_hide_wp_foft_loader_menus() {
	//Hide "Settings → WP FOFT Loader".
	remove_submenu_page('options-general.php', 'wp-foft-loader');
	//Hide "Settings → Affiliation".
	remove_submenu_page('options-general.php', 'wp-foft-loader-affiliation');
	//Hide "Settings → Contact Us".
	remove_submenu_page('options-general.php', 'wp-foft-loader-contact');
	//Hide "Settings → Support Forum".
	remove_submenu_page('options-general.php', 'wp-foft-loader-wp-support-forum');
	//Hide "Settings → Upgrade".
	remove_submenu_page('options-general.php', 'wp-foft-loader-pricing');
}

add_action('admin_menu', 'plt_hide_wp_foft_loader_menus', 1000000000);

Where do I put this code?