How to Hide WP Speed of Light Admin Menus

function plt_hide_wp_speed_of_light_menus() {
	//Hide "WP Speed of Light".
	remove_menu_page('wpsol_dashboard');
	//Hide "WP Speed of Light → Dashboard".
	remove_submenu_page('wpsol_dashboard', 'wpsol_dashboard');
	//Hide "WP Speed of Light → Speed optimization".
	remove_submenu_page('wpsol_dashboard', 'wpsol_speed_optimization');
	//Hide "WP Speed of Light → Speed analysis".
	remove_submenu_page('wpsol_dashboard', 'wpsol_speed_analysis');
	//Hide "WP Speed of Light → More SpeedUp".
	remove_submenu_page('wpsol_dashboard', 'wpsol_more_speedup');
}

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

Where do I put this code?