How to Hide Ethereum Wallet Admin Menus

function plt_hide_ethereum_wallet_menus() {
	//Hide "Tools → Scheduled Actions".
	remove_submenu_page('tools.php', 'action-scheduler');

	//Hide "Settings → Ethereum Wallet".
	remove_submenu_page('options-general.php', 'ethereum-wallet');
	//Hide "Settings → Affiliation".
	remove_submenu_page('options-general.php', 'ethereum-wallet-affiliation');
	//Hide "Settings → Contact Us".
	remove_submenu_page('options-general.php', 'ethereum-wallet-contact');
	//Hide "Settings → Support Forum".
	remove_submenu_page('options-general.php', 'ethereum-wallet-wp-support-forum');
	//Hide "Settings → Upgrade".
	remove_submenu_page('options-general.php', 'ethereum-wallet-pricing');
}

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