How to Hide Bancomail Email Lists Integration Admin Menus

function plt_hide_bancomail_email_lists_integration_menus() {
	//Hide the "Bancomail Email Lists Integration" menu.
	remove_menu_page('bancomail-email-lists-integration');
	//Hide the "Bancomail Email Lists Integration → Bancomail Email Lists Integration" menu.
	remove_submenu_page('bancomail-email-lists-integration', 'bancomail-email-lists-integration');
	//Hide the "Bancomail Email Lists Integration → Orders history" menu.
	remove_submenu_page('bancomail-email-lists-integration', 'bancomail-email-lists-integration-ordini');
}

add_action('admin_menu', 'plt_hide_bancomail_email_lists_integration_menus', 11);

Where do I put this code?