Client code

using UnityEngine;
using System.Collections;
using UnityEngine.Networking.Match;
using UnityEngine.Networking;
using Steamworks;
using System;

[RequireComponent(typeof(TextMesh))]
public class SelectableMatch : Selectable {
	CSteamID _joinThis;
	public CSteamID JoinThis {
		set {
			if(SteamManager.Initialized) {
				var text = GetComponent<TextMesh>();
				text.text = SteamMatchmaking.GetLobbyData(value, "name");
				_joinThis = value;
			}
		}
		get {
			return _joinThis;
		}
	}
	public NATTraversal.NetworkManager manager;

	// Use this for initialization
	void Start () {

	}

	// Update is called once per frame
	void Update () {

	}

	public override void OnSelect() {
		print("Selected!");
		print(JoinThis);
		if(SteamManager.Initialized) {
			print("Joining: " + SteamMatchmaking.GetLobbyData(JoinThis, "name") + " at " + SteamMatchmaking.GetLobbyData(JoinThis, "publicIP"));
			manager.StartClientAll(SteamMatchmaking.GetLobbyData(JoinThis, "publicIP"),
				SteamMatchmaking.GetLobbyData(JoinThis, "internalIP"),
				Convert.ToUInt64(SteamMatchmaking.GetLobbyData(JoinThis, "guid")));
			//manager.StartClient();
		}
	}
}