How to Hide the "Trusty WBS Form" Admin Menu

function plt_hide_trusty_whistleblowing_solution_menus() {
	//Hide the "Trusty WBS Form" menu.
	remove_menu_page('trusty-form');
}

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

Where do I put this code?