How to Hide Best Watermark - Protect images on your site with iLoveIMG Admin Menus

function plt_hide_watermark_protect_images_menus() {
	//Hide "Media → Bulk Watermark".
	remove_submenu_page('upload.php', 'iloveimg-media-watermark-page');

	//Hide "iLoveIMG".
	remove_menu_page('iloveimg-admin-page');
	//Hide "iLoveIMG → Compress settings".
	remove_submenu_page('iloveimg-admin-page', 'iloveimg-compress-admin-page');
	//Hide "iLoveIMG → Watermark settings".
	remove_submenu_page('iloveimg-admin-page', 'iloveimg-watermark-admin-page');
}

add_action('admin_menu', 'plt_hide_watermark_protect_images_menus', 1000);

Where do I put this code?