How to Hide EthPress Admin Menus

function plt_hide_ethpress_menus() {
	//Hide "Settings → EthPress".
	remove_submenu_page('options-general.php', 'ethpress');
	//Hide "Settings → Affiliation".
	remove_submenu_page('options-general.php', 'ethpress-affiliation');
	//Hide "Settings → Contact Us".
	remove_submenu_page('options-general.php', 'ethpress-contact');
	//Hide "Settings → Support Forum".
	remove_submenu_page('options-general.php', 'ethpress-wp-support-forum');
	//Hide "Settings → Add-Ons".
	remove_submenu_page('options-general.php', 'ethpress-addons');
	//Hide "Settings → Upgrade".
	remove_submenu_page('options-general.php', 'ethpress-pricing');
}

add_action('admin_menu', 'plt_hide_ethpress_menus', 1000000000);
Where do I put this code?