How to Hide the "Frontend Reset Password" Admin Menu

function plt_hide_frontend_reset_password_menus() {
	//Hide the "Settings → Frontend Reset Password" menu.
	remove_submenu_page('options-general.php', 'somfrp_options_page');
}

add_action('admin_menu', 'plt_hide_frontend_reset_password_menus', 96);

Where do I put this code?