Where did custom games/ races go online?

Ok so I just got forza 5 LE yesterday and I jumped right into online. I usually clicked custom races/games on forzamotosport 4, and play tag virus. I noticed that custom races online weren’t there, so if I’m missing something can someone tell me what I’m doing wrong?

Custom public lobbies is not a feature of Forza 5. If you’d like to see it added, please post in the official Game Features Wish List thread:
http://forums.forza.net/turn10_postst207_Forza-Motorsport-5-Game-Features-Wish-List.aspx