How to Hide ZeroBounce Email Validator Admin Menus

function plt_hide_zerobounce_menus() {
	//Hide "ZeroBounce Email".
	remove_menu_page('zerobounce-email-validator');
	//Hide "ZeroBounce Email → Dashboard".
	remove_submenu_page('zerobounce-email-validator', 'zerobounce-email-validator');
	//Hide "ZeroBounce Email → Settings".
	remove_submenu_page('zerobounce-email-validator', 'zerobounce-email-validator-settings');
	//Hide "ZeroBounce Email → Tools".
	remove_submenu_page('zerobounce-email-validator', 'zerobounce-email-validator-tools');
	//Hide "ZeroBounce Email → Logs".
	remove_submenu_page('zerobounce-email-validator', 'zerobounce-email-validator-logs');
}

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

Where do I put this code?