How to Hide Share This Image Admin Menus

function plt_hide_share_this_image_menus() {
	//Hide "Share Images".
	remove_menu_page('sti-options');
	//Hide "Share Images → Settings".
	remove_submenu_page('sti-options', 'sti-options');
	//Hide "Share Images → Pro Features".
	remove_submenu_page('sti-options', 'http://127.0.0.1/wp-admin/admin.php?page=sti-options&tab=premium');
	//Hide "Share Images → Upgrade".
	remove_submenu_page('sti-options', 'sti-options-pricing');
}

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

Where do I put this code?